Move on to Java 21

Signed-off-by: Alexander Brandes <mc.cache@web.de>

Author: NotMyFault

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Clean Build
         run: ./gradlew clean build
       - name: Archive Artifacts

.github/workflows/upload-release-asset.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           distribution: temurin
           cache: gradle
-          java-version: 17
+          java-version: 21
       - name: Clean Build
         run: ./gradlew clean build
       - name: Upload Release Assets

build.gradle.kts

@@ -10,15 +10,15 @@ plugins {
 }
 
 the<JavaPluginExtension>().toolchain {
-    languageVersion.set(JavaLanguageVersion.of(17))
+    languageVersion.set(JavaLanguageVersion.of(21))
 }
 
 configurations.all {
-    attributes.attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
+    attributes.attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 21)
 }
 
 tasks.compileJava.configure {
-    options.release.set(17)
+    options.release.set(21)
 }
 
 version = "7.0.1-SNAPSHOT"