Unpin importlib_metadata

[zameel7]

https://github.com/open-telemetry/opentelemetry-python/issues/3570 has been resolved

Description:

This PR closes the issue #407

Merge checklist:

• [ ] All reviewers approved
• [ ] CI build is green
• [ ] If adding new checks, followed how_tos/0001-adding-new-checks.rst
• [ ] Changelog record added (if needed)
• [ ] Documentation updated (not only docstrings) (if needed)
• [ ] Commits are squashed

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