Bump rpki-validator from 2.13.5 to 2.13.7

Bumps [rpki-validator](https://github.com/massimocandela/rpki-validator) from 2.13.5 to 2.13.7.
- [Release notes](https://github.com/massimocandela/rpki-validator/releases)
- [Commits](massimocandela/rpki-validator@v2.13.5...v2.13.7)

---
updated-dependencies:
- dependency-name: rpki-validator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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