Add Java 23 into test matrix (#2264)

Author: Goooler

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
       matrix:
         kind: [maven, gradle]
         # Test on the latest Java version once Gradle & Maven support it.
-        jre: [11, 17, 21, 22]
+        jre: [11, 17, 21, 23]
         os: [ubuntu-latest]
         include:
           # test windows at the diagonals of the above matrix

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java

@@ -54,8 +54,11 @@ public enum GradleVersionSupport {
 		GradleVersionSupport(String version) {
 			String minVersionForRunningJRE;
 			switch (Jvm.version()) {
-			case 23:
+			case 24:
 				// TODO: https://docs.gradle.org/current/userguide/compatibility.html
+			case 23:
+				minVersionForRunningJRE = "8.10";
+				break;
 			case 22:
 				minVersionForRunningJRE = "8.8";
 				break;