mypy: CI setup workaround still needed?

Author: amotl

.github/workflows/main.yaml

@@ -34,12 +34,6 @@ jobs:
         if: steps.restore-pre-commit-hooks.outputs.cache-hit != 'true'
         run: |
           pre-commit install-hooks
-      - name: Create .mypy_cache directory
-        run: |
-          # error: --install-types failed (no mypy cache directory)
-          # https://github.com/python/mypy/issues/10600
-          # https://github.com/python/mypy/issues/10768
-          mkdir .mypy_cache
       - name: Lint
         run: |
           pre-commit run --all-files