Update dependency importlib_resources to v5.7.1

This MR contains the following updates:

Package	Type	Update	Change
importlib_resources	ironbank-pypi	minor	5.4.0 -> 5.7.1

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Release Notes

python/importlib_resources

v5.7.1

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• #​249: In simple.ResourceContainer.joinpath, honor names split by posixpath.sep.

v5.7.0

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• #​248: abc.Traversable.joinpath now allows for multiple arguments and specifies that posixpath.sep is allowed in any argument to accept multiple arguments, matching the behavior found in zipfile.Path and pathlib.Path.

  simple.ResourceContainer now honors this behavior.

v5.6.0

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• #​244: Add type declarations in ABCs.

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