[Rpm-maint] [rpm-software-management/rpm] pythondistdeps: Switch to importlib.metadata (#1317)

[lgtm-com[bot]]

This pull request **fixes 1 alert** when merging 783cf4e257acf0b7586e36077259fbd61956a6d3 into a2e072d45243bcfaa7797514bb40c85e9b8fa74c - [view on LGTM.com](https://lgtm.com/projects/g/rpm-software-management/rpm/rev/pr-d357aba1ed1ac9bd07fcaf5be15b04a2d4d9dfe3)

**fixed alerts:**

* 1 for Module is imported more than once

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