chore(deps): bump proc-macro2 from 1.0.51 to 1.0.52

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.51 to 1.0.52.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](dtolnay/proc-macro2@1.0.51...1.0.52)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>