Bump the GMT version to 6.6.0 in CI

[seisman]

See checklist at #4017.

Previous PR at #2962.

[seisman]

It seems there are conflicts between GMT and contextily.

[weiji14]

It seems there are conflicts between GMT and contextily.

Yes, GMT 6.6.0 was built on GDAL 3.11, and contextily depends on rasterio which doesn't support GDAL 3.11 yet. Need to wait for conda-forge/rasterio-feedstock#332

  error    libmamba Could not solve for environment specs
      The following packages are incompatible
      ├─ contextily =* * is installable with the potential options
      │  ├─ contextily [0.9.0|0.9.2] would require
      │  │  └─ python =2.7 * with the potential options
      │        │  └─ libgdal [>=3.7.2,<3.8.0a0 *|>=3.7.3,<3.8.0a0 *], which can be installed (as previously explained);
      │        ├─ rasterio [1.4.2|1.4.3] would require
      │        │  └─ libgdal-core [>=3.10.0,<3.11.0a0 *|>=3.10.2,<3.11.0a0 *] with the potential options
      │        │     ├─ libgdal-core [3.10.2|3.10.3|3.9.3], which can be installed (as previously explained);
      │        │     ├─ libgdal-core [3.10.0|3.10.1|3.10.2|3.9.2|3.9.3], which can be installed (as previously explained);
      │        │     └─ libgdal-core 3.10.3, which can be installed;
      │        ├─ rasterio 1.4.2 would require
      │        │  └─ libgdal-core >=3.9.3,<3.10.0a0 *, which can be installed (as previously explained);
      │        ├─ rasterio [1.0.23|1.0.24|...|1.1.2] would require
      │        │  └─ libgdal [>=2.4.1,<2.5.0a0 *|>=2.4.2,<2.5.0a0 *|>=2.4.3,<2.5.0a0 *|>=3.0.1,<3.1.0a0 *|>=3.0.2,<3.1.0a0 *] with the potential options
      │        │     ├─ libgdal [2.4.1|2.4.2|2.4.3|3.0.1|3.0.2] would require
      │        │     │  └─ geos >=3.7.2,<3.7.3.0a0 *, which can be installed;
      │        │     ├─ libgdal [2.4.4|3.0.2|3.0.3|3.0.4] would require
      │        │     │  └─ geos >=3.8.0,<3.8.1.0a0 *, which can be installed;
      │        │     └─ libgdal [2.4.4|3.0.4|...|3.2.1] would require
      │        │        └─ geos >=3.8.1,<3.8.2.0a0 *, which can be installed;
      │        ├─ rasterio [1.1.3|1.1.4|1.1.5] would require
      │        │  └─ libgdal [>=2.4.4,<2.5.0a0 *|>=3.0.4,<3.1.0a0 *], which can be installed (as previously explained);
      │        ├─ rasterio [1.1.6|1.1.7|...|1.2.6] would require
      │        │  └─ libgdal [>=3.1.2,<3.2.0a0 *|>=3.1.3,<3.2.0a0 *|>=3.1.4,<3.2.0a0 *|>=3.2.1,<3.3.0a0 *] with the potential options
      │        │     ├─ libgdal [3.1.4|3.2.1|...|3.3.3] would require
      │        │     │  └─ geos >=3.9.1,<3.9.2.0a0 *, which can be installed;
      │        │     ├─ libgdal [2.4.4|3.0.4|...|3.2.1], which can be installed (as previously explained);
      │        │     └─ libgdal [3.1.4|3.2.1] would require
      │        │        └─ geos >=3.9.0,<3.9.1.0a0 *, which can be installed;
      │        ├─ rasterio [1.2.10|1.3.0] would require
      │        │  └─ libgdal >=3.5.0,<3.6.0a0 * with the potential options
      │        │     ├─ libgdal [3.5.3|3.6.3|3.6.4|3.7.0], which can be installed (as previously explained);
      │        │     ├─ libgdal [3.3.3|3.4.1|3.4.2|3.4.3|3.5.0] would require
      │        │     │  └─ geos >=3.10.2,<3.10.3.0a0 *, which can be installed;
      │        │     ├─ libgdal [3.4.3|3.5.3|...|3.6.3], which can be installed (as previously explained);
      │        │     ├─ libgdal [3.5.0|3.5.1|3.5.2|3.5.3|3.6.0] would require
      │        │     │  └─ geos >=3.11.0,<3.11.1.0a0 *, which can be installed;
      │        │     └─ libgdal 3.5.0 would require
      │        │        └─ geos >=3.10.3,<3.10.4.0a0 *, which can be installed;
      │        ├─ rasterio 1.2.10 would require
      │        │  └─ libgdal >=3.4.0,<3.5.0a0 * with the potential options
      │        │     ├─ libgdal [3.3.3|3.4.0|3.4.1] would require
      │        │     │  └─ geos >=3.10.1,<3.10.2.0a0 *, which can be installed;
      │        │     ├─ libgdal [3.3.3|3.4.0] would require
      │        │     │  └─ geos >=3.10.0,<3.10.1.0a0 *, which can be installed;
      │        │     ├─ libgdal [3.3.3|3.4.1|3.4.2|3.4.3|3.5.0], which can be installed (as previously explained);
      │        │     └─ libgdal [3.4.3|3.5.3|...|3.6.3], which can be installed (as previously explained);
      │        ├─ rasterio 1.2.10 would require
      │        │  └─ libgdal >=3.4.1,<3.5.0a0 *, which can be installed (as previously explained);
      │        ├─ rasterio [1.2.10|1.2.6|1.2.7|1.2.8|1.2.9] would require
      │        │  └─ libgdal [>=3.3.0,<3.4.0a0 *|>=3.3.1,<3.4.0a0 *|>=3.3.2,<3.4.0a0 *|>=3.3.3,<3.4.0a0 *], which can be installed (as previously explained);
      │        ├─ rasterio [1.2.4|1.2.5|1.2.6] would require
      │        │  └─ libgdal >=3.2.2,<3.3.0a0 *, which can be installed (as previously explained);
      │        ├─ rasterio [1.3.0.post1|1.3.1|1.3.2|1.3.3] would require
      │        │  └─ libgdal [>=3.5.1,<3.6.0a0 *|>=3.5.2,<3.6.0a0 *|>=3.5.3,<3.6.0a0 *], which can be installed (as previously explained);
      │        └─ rasterio 1.3.4 would require
      │           └─ libgdal >=3.6.0,<3.7.0a0 *, which can be installed (as previously explained);
      └─ gmt =6.6.0 * is not installable because it requires
         ├─ geos >=3.13.1,<3.13.2.0a0 *, which conflicts with any installable versions previously reported;
         ├─ libgdal-core >=3.11.3,<3.12.0a0 *, which requires
         │  └─ openssl >=3.5.1,<4.0a0 *, which conflicts with any installable versions previously reported;
         └─ libglib >=2.84.2,<3.0a0 *, which requires
            └─ pcre2 >=10.45,<10.46.0a0 *, which conflicts with any installable versions previously reported.
  critical libmamba Could not solve for environment specs