"Building MDAnalysis" in the "Contributing to the main codebase" tutorial breaks when installing optional dependencies #416

Collecting package metadata (repodata.json): done
Solving environment: / warning  libmamba Added empty dependency for problem type SOLVER_RULE_UPDATE
failed

LibMambaUnsatisfiableError: Encountered problems while solving:
  - nothing provides requested clustalw 2.1**
  - package duecredit-0.10.0-pyhd8ed1ab_0 requires citeproc-py >=0.4, but none of the providers can be installed

Could not solve for environment specs
The following packages are incompatible
├─ clustalw 2.1**  does not exist (perhaps a typo or a missing channel);
├─ duecredit is installable and it requires
│  └─ citeproc-py >=0.4  with the potential options
│     ├─ citeproc-py 0.6.0 would require
│     │  └─ python >=3.10,<3.11.0a0 , which can be installed;
│     ├─ citeproc-py 0.6.0 would require
│     │  └─ python >=3.11,<3.12.0a0 , which can be installed;
│     ├─ citeproc-py 0.6.0 would require
│     │  └─ python >=3.7,<3.8.0a0 , which can be installed;
│     ├─ citeproc-py 0.6.0 would require
│     │  └─ python >=3.8,<3.9.0a0 , which can be installed;
│     ├─ citeproc-py 0.6.0 would require
│     │  └─ python >=3.9,<3.10.0a0 , which can be installed;
│     └─ citeproc-py 0.6.0 would require
│        └─ python >=3.12,<3.13.0a0 , which can be installed;
└─ pin-1 is not installable because it requires
   └─ python 3.13.* , which conflicts with any installable versions previously reported.