MAINT: fix linting issues

Author: richardjgowers

.github/workflows/ci.yml

@@ -105,20 +105,7 @@ jobs:
         run: |
           conda info --all
           conda list
-      - name: Install linter / formatter
-        shell: bash -l {0}
-        run: |
-          mamba install pylint black
       - name: Install package
         shell: bash -l {0}
         run: |
           python -m pip install --no-deps .
-      - name: Run pylint
-        shell: bash -l {0}
-        run: |
-          pylint cinnabar/ --fail-under 6
-      - name: Run black check
-        shell: bash -l {0}
-        if: always()
-        run: |
-          black --check -l 99 cinnabar/ --exclude cinnabar/_version.py