improve: java version minimal 11, tested on 21 (#2207)

Signed-off-by: Attila Mészáros <csviri@gmail.com>

.github/workflows/pr.yml

@@ -34,7 +34,7 @@ jobs:
   integration_tests:
     strategy:
       matrix:
-        java: [ 11, 17 ]
+        java: [ 17, 21 ]
         kubernetes: [ 'v1.26.13', 'v1.27.10', 'v1.28.6', 'v1.29.1' ]
     uses: ./.github/workflows/integration-tests.yml
     with:
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ 11, 17 ]
+        java: [ 17, 21 ]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Java and Maven

.github/workflows/release-project-in-dir.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Java and Maven
         uses: actions/setup-java@v4
         with:
-          java-version: 11
+          java-version: 17
           distribution: temurin
           cache: 'maven'
 
@@ -61,7 +61,7 @@ jobs:
       - name: Set up Java and Maven
         uses: actions/setup-java@v4
         with:
-          java-version: 11
+          java-version: 17
           distribution: temurin
           cache: 'maven'
 

.github/workflows/snapshot-releases.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
           cache: 'maven'
       - name: Build and test project
         run: ./mvnw ${MAVEN_ARGS} clean install --file pom.xml
@@ -34,7 +34,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
           cache: 'maven'
       - name: Release Maven package
         uses: samuelmeuli/action-maven-publish@v1