Install pre-commit-update from PyPI and restrict conda to conda-forge channel

[Copilot]

pre-commit-update is not available on conda-forge, and conda install without explicit channel overrides can fall back to the anaconda defaults channel.

Changes

• pre_commit_update_workflow.yml

  • Replace conda install with micromamba install --override-channels -c conda-forge for pre-commit and gh
  • Install pre-commit-update via pip (PyPI) instead of conda

• docs_workflow.yml

  • Replace conda install with micromamba install --override-channels -c conda-forge to prevent implicit use of the anaconda defaults channel

# Before
conda install -y pre-commit pre-commit-update "gh !=2.76.0"

# After
micromamba install -y --override-channels -c conda-forge \
  pre-commit "gh !=2.76.0"
python -m pip install pre-commit-update