Lock the jvm-version related tests down to just one version.

Author: nedtwigg

testlib/src/test/java/com/diffplug/spotless/java/GoogleJavaFormatStepTest.java

@@ -17,8 +17,8 @@
 
 import static org.junit.jupiter.api.condition.JRE.JAVA_13;
 import static org.junit.jupiter.api.condition.JRE.JAVA_15;
-import static org.junit.jupiter.api.condition.JRE.JAVA_16;
 import static org.junit.jupiter.api.condition.JRE.JAVA_20;
+import static org.junit.jupiter.api.condition.JRE.JAVA_21;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledForJreRange;
@@ -62,6 +62,7 @@ void behavior() throws Exception {
 	}
 
 	@Test
+	@EnabledForJreRange(min = JAVA_21, max = JAVA_21)
 	void versionBelowMinimumRequiredVersionIsNotAllowed() throws Exception {
 		FormatterStep step = GoogleJavaFormatStep.create("1.2", "AOSP", TestProvisioner.mavenCentral());
 		StepHarness.forStepNoRoundtrip(step)
@@ -70,7 +71,7 @@ void versionBelowMinimumRequiredVersionIsNotAllowed() throws Exception {
 	}
 
 	@Test
-	@EnabledForJreRange(min = JAVA_16)
+	@EnabledForJreRange(min = JAVA_21, max = JAVA_21)
 	void versionBelowOneDotTenIsNotAllowed() throws Exception {
 		FormatterStep step = GoogleJavaFormatStep.create("1.9", "AOSP", TestProvisioner.mavenCentral());
 		StepHarness.forStepNoRoundtrip(step)