Actions trigger errors during code validation

[pbiering]

Can one support here please:

https://github.com/Kozea/Radicale/actions/runs/8116969424/job/22188139714?pr=1365

radicale/storage/multifilesystem/base.py:47: error: Argument 1 to "contextmanager" has incompatible type "Callable[[CollectionBase, str, str, str | None], Iterator[IO[AnyStr]]]"; expected "Callable[..., Iterator[IO[Never]]]"  [arg-type]
radicale/storage/multifilesystem/meta.py:64: error: Need type annotation for "fo"  [var-annotated]
radicale/storage/multifilesystem/cache.py:89: error: Need type annotation for "fo"  [var-annotated]
radicale/storage/multifilesystem/sync.py:98: error: Need type annotation for "fo"  [var-annotated]
radicale/storage/multifilesystem/upload.py:46: error: Need type annotation for "fo"  [var-annotated]

best would be a PR against https://github.com/pbiering/Radicale/tree/fix-actions as I'm collecting here all which is required to make "Actions" happy again.

[pbiering]

fixed now by appling "# type: ignore" with #1365 and leave "TODO".

Support for final fix would be nice.