Bump oxsecurity/megalinter from 9.1.0 to 9.4.0

Bumps [oxsecurity/megalinter](https://github.com/oxsecurity/megalinter) from 9.1.0 to 9.4.0.
- [Release notes](https://github.com/oxsecurity/megalinter/releases)
- [Changelog](https://github.com/oxsecurity/megalinter/blob/main/CHANGELOG.md)
- [Commits](https://github.com/oxsecurity/megalinter/compare/v9.1.0...v9.4.0)

---
updated-dependencies:
- dependency-name: oxsecurity/megalinter
  dependency-version: 9.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
           fetch-depth: 0
 
       - name: MegaLinter
-        uses: oxsecurity/megalinter/flavors/c_cpp@v9.1.0
+        uses: oxsecurity/megalinter/flavors/c_cpp@v9.4.0
         env:
           VALIDATE_ALL_CODEBASE: true
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}