Update to Gradle 8.10.2

Issue gh-933

buildSrc/src/main/groovy/io/spring/gradle/convention/AbstractSpringJavaPlugin.groovy

@@ -65,8 +65,16 @@ public abstract class AbstractSpringJavaPlugin implements Plugin<Project> {
         project.test {
             useJUnitPlatform()
         }
+		project.java.sourceCompatibility = toolchainVersion(project)
 		additionalPlugins(project);
 	}
 
 	protected abstract void additionalPlugins(Project project);
+
+	private Integer toolchainVersion(Project project) {
+		if (project.hasProperty("testToolchain")) {
+			return project.property("testToolchain").toString().toInteger();
+		}
+		return 17;
+	}
 }

buildSrc/src/main/groovy/io/spring/gradle/convention/TestsConfigurationPlugin.groovy

@@ -43,7 +43,7 @@ public class TestsConfigurationPlugin implements Plugin<Project> {
 		}
 
 		project.tasks.create('testJar', Jar) {
-			classifier = 'test'
+			archiveClassifier = 'test'
 			from project.sourceSets.test.output
 		}
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists