Pin Rust in environment.yml for peridic-hamiltonian (#172)

Author: ppegolo

examples/periodic-hamiltonian/environment.yml

@@ -2,9 +2,10 @@ channels:
   - conda-forge
 dependencies:
   - python>=3.11
-  - pip
   - graphviz
   - pyscf=2.3.0
+  - rust=1.88.*
+  - pip
   - pip:
       - pyscfad @ git+https://github.com/fishjojo/pyscfad.git@ml#egg=pyscfad
       - ase==3.22.1