Update actions/setup-java action to v6

| datasource  | package            | from   | to     |
| ----------- | ------------------ | ------ | ------ |
| github-tags | actions/setup-java | v5.7.0 | v6.0.0 |

Author: renovate[bot]

.github/workflows/secure-tests.yml

@@ -195,7 +195,7 @@ jobs:
           node-version: '24'
 
       - name: Set Up Java
-        uses: actions/setup-java@b6effb05e454b25005698d916606bdc6ffcbf961 # v5.7.0
+        uses: actions/setup-java@dd06d9cba3e5552c54d9f8ea23572deb30010f7c # v6.0.0
         with:
           distribution: 'temurin'
           java-version: '21'