Run GraalVmStarterTests against GraalVM CE 21

Later versions no longer require `--initialize-at-build-time`

Author: marcphilipp

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
       with:
         distribution: graalvm-community
         version: 'latest'
-        java-version: '25'
+        java-version: '21'
     - name: Build
       uses: ./.github/actions/main-build
       with:

platform-tooling-support-tests/projects/graalvm-starter/build.gradle.kts

@@ -13,6 +13,10 @@ dependencies {
 	testRuntimeOnly("org.junit.platform:junit-platform-reporting:$junitVersion")
 }
 
+tasks.withType<JavaCompile>().configureEach {
+	options.release = 21
+}
+
 tasks.test {
 	useJUnitPlatform {
 		includeEngines("junit-platform-suite")
@@ -35,9 +39,6 @@ val initializeAtBuildTime = mapOf(
 		"org.junit.platform.launcher.core.DiscoveryIssueNotifier\$1",
 		"org.junit.platform.launcher.core.HierarchicalOutputDirectoryCreator",
 	),
-	"6.0" to listOf(
-		"org.junit.platform.commons.logging.LoggerFactory\$DelegatingLogger",
-	),
 )
 
 graalvmNative {