Bump proc-macro-warning from 0.3.1 to 0.4.1 (#14171)

Bumps [proc-macro-warning](https://github.com/ggwpez/proc-macro-warning) from 0.3.1 to 0.4.1.
- [Commits](https://github.com/ggwpez/proc-macro-warning/compare/v0.3.1...v0.4.1

)

---
updated-dependencies:
- dependency-name: proc-macro-warning
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: parity-processbot <>