Bump proc-macro-warning from 0.4.1 to 0.4.2 (#1376)

Bumps [proc-macro-warning](https://github.com/ggwpez/proc-macro-warning) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/ggwpez/proc-macro-warning/releases)
- [Commits](https://github.com/ggwpez/proc-macro-warning/compare/v0.4.1...v0.4.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>