Remove JDK 8 from CI builds

Author: marcphilipp

.github/actions/setup-test-jdk/action.yml

@@ -8,13 +8,6 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
-      with:
-        distribution: ${{ inputs.distribution }}
-        java-version: 8
-        check-latest: true
-    - shell: bash
-      run: echo "JDK8=$JAVA_HOME" >> $GITHUB_ENV # zizmor: ignore[github-env]
     - uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
       with:
         distribution: ${{ inputs.distribution }}