Bump single-source from 0.2.0 to 0.3.0

[dependabot[bot]]

Bumps single-source from 0.2.0 to 0.3.0.

Commits

• 79dba95 Update pyproject.toml
• 1e7426f Merge pull request #7 from Neki/feat-support-importlib-4
• 8aa3f31 feat: allow use with importlib_metadata version 4
• See full diff in compare view

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[lemonsaurus]

@dependabot rebase