Bump rubocop-on-rbs from 1.5.0 to 1.6.0

Bumps [rubocop-on-rbs](https://github.com/ksss/rubocop-on-rbs) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/ksss/rubocop-on-rbs/releases)
- [Changelog](https://github.com/ksss/rubocop-on-rbs/blob/main/CHANGELOG.md)
- [Commits](ksss/rubocop-on-rbs@v1.5.0...v1.6.0)

---
updated-dependencies:
- dependency-name: rubocop-on-rbs
  dependency-version: 1.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -125,7 +125,7 @@ GEM
     rubocop-ast (1.44.1)
       parser (>= 3.3.7.2)
       prism (~> 1.4)
-    rubocop-on-rbs (1.5.0)
+    rubocop-on-rbs (1.6.0)
       lint_roller (~> 1.1)
       rbs (~> 3.5)
       rubocop (>= 1.72.1, < 2.0)