Bump actions/checkout from 2 to 3 (#21)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/maven.yml

@@ -18,7 +18,7 @@ jobs:
           distribution: adopt
 
       # Checkout project files
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       # Caches
       - name: 'Cache: Maven'
@@ -70,7 +70,7 @@ jobs:
           distribution: adopt
 
       # Checkout project files
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis