Bump urllib3 from 1.25.8 to 1.26.5 in /updater

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.8 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.8...1.26.5)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

updater/requirements.txt

@@ -27,7 +27,7 @@ requests-toolbelt==0.9.1
 rlp==1.2.0
 six==1.14.0
 toolz==0.10.0
-urllib3==1.25.8
+urllib3==1.26.5
 varint==1.0.2
 web3==5.0.0
 websockets==7.0