Bump cookstyle from 7.28.2 to 7.30.4 in /omnibus

Bumps [cookstyle](https://github.com/chef/cookstyle) from 7.28.2 to 7.30.4.
- [Release notes](https://github.com/chef/cookstyle/releases)
- [Changelog](https://github.com/chef/cookstyle/blob/main/CHANGELOG.md)
- [Commits](chef/cookstyle@v7.28.2...v7.30.4)

---
updated-dependencies:
- dependency-name: cookstyle
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

omnibus/Gemfile.lock

@@ -145,8 +145,8 @@ GEM
     contracts (0.16.1)
     cookbook-omnifetch (0.11.1)
       mixlib-archive (>= 0.4, < 2.0)
-    cookstyle (7.28.2)
-      rubocop (= 1.24.1)
+    cookstyle (7.30.4)
+      rubocop (= 1.25.0)
     diff-lcs (1.3)
     ed25519 (1.2.4)
     erubi (1.10.0)
@@ -310,9 +310,9 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.2)
-    rubocop (1.24.1)
+    rubocop (1.25.0)
       parallel (~> 1.10)
-      parser (>= 3.0.0.0)
+      parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml