deps(ci): bump actions/setup-java from 4 to 5

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 4 to 5.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](https://github.com/actions/setup-java/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/setup-java
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/release.yml

@@ -91,7 +91,7 @@ jobs:
           cache-dependency-path: komga-webui/package-lock.json
 
       - name: Setup Java 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 21
           java-package: 'jdk'

.github/workflows/tests.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Setup Java 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 21
           java-package: 'jdk'