Update dependency importlib-metadata to v4

This MR contains the following updates:

Package	Type	Update	Change
importlib-metadata	dependencies	major	^3.0.0 -> ^4.0.0

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Release Notes

python/importlib_metadata

v4.0.1

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• #​306: Clearer guidance about compatibility in readme.

v4.0.0

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• #​304: PackageMetadata as returned by metadata() and Distribution.metadata() now provides normalized metadata honoring PEP 566:

  • If a long description is provided in the payload of the RFC 822 value, it can be retrieved as the Description field.
  • Any multi-line values in the metadata will be returned as such.
  • For any multi-line values, line continuation characters are removed. This backward-incompatible change means that any projects relying on the RFC 822 line continuation characters being present must be tolerant to them having been removed.
  • Add a json property that provides the metadata converted to a JSON-compatible form per PEP 566.

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This MR has been generated by Renovate Bot.

added 5 commits

• 327549b6...b9fe9e08 - 4 commits from branch master
• 072a542e - Update dependency importlib-metadata to v4

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changed the description

merged

mentioned in commit f1088ad8