Revert "Add CITATION.cff validation to lint workflow"

This reverts commit dcff566.

As we no longer have CITATION.cff and this was causing linters to fail.

We also need to trigger yet another release since zenodo integration for some
reason was off.

.github/workflows/lint.yml

@@ -22,10 +22,6 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install --upgrade tox
-          python -m pip install --upgrade cffconvert pyyaml
 
       - name: Run linters
         run: tox -e lint
-
-      - name: Validate CITATION.cff
-        run: cffconvert --validate