build(deps): Bump proc-macro2 in /tests/host_tools/uffd

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.57 to 1.0.60.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](dtolnay/proc-macro2@1.0.57...1.0.60)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]