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

[lgtm-com[bot]]

This pull request **fixes 1 alert** when merging e9014874eb5f8ce2b349648d85e468885c4a5cff into 276f61949f24b647129d11b1ecb9dc7bd7c9691b - [view on LGTM.com](https://lgtm.com/projects/g/rpm-software-management/rpm/rev/pr-e6d51d1da04c85f35cff47832c088185c94d6558)

**fixed alerts:**

* 1 for Module is imported more than once

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