Upgrade Gradle 9 versions used in compatibility tests

Gradle 9.1 will deprecate support for declaring dependencies using
a map. To adapt to this, a handful of tests have been updated to
use single-string notation instead.

Closes gh-46902

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/plugin/JavaPluginActionIntegrationTests-additionalMetadataLocationsConfiguredWhenProcessorIsPresent.gradle

@@ -24,8 +24,7 @@ repositories {
 }
 
 dependencies {
-	def configurationName = configurations.findByName('annotationProcessor') != null ? 'annotationProcessor' : 'implementation'
+	annotationProcessor(':spring-boot-configuration-processor:1.2.3')
-	add(configurationName, [name: 'spring-boot-configuration-processor-1.2.3'])
 }
 
 compileJava {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests-jarTypeFilteringIsApplied.gradle

@@ -30,8 +30,8 @@ repositories {
 }
 
 dependencies {
-	implementation(name: "standard")
+	implementation(":standard:")
-	implementation(name: "starter")
+	implementation(":starter:")
 }
 
 bootJar {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootWarIntegrationTests-jarTypeFilteringIsApplied.gradle

@@ -30,8 +30,8 @@ repositories {
 }
 
 dependencies {
-	implementation(name: "standard")
+	implementation(":standard:")
-	implementation(name: "starter")
+	implementation(":starter:")
 }
 
 bootWar {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/run/BootRunIntegrationTests-jarTypeFilteringIsAppliedToTheClasspath.gradle

@@ -26,6 +26,6 @@ repositories {
 }
 
 dependencies {
-	implementation(name: "standard")
+	implementation(":standard:")
-	implementation(name: "starter")
+	implementation(":starter:")
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/run/BootTestRunIntegrationTests-jarTypeFilteringIsAppliedToTheClasspath.gradle

@@ -26,6 +26,6 @@ repositories {
 }
 
 dependencies {
-	implementation(name: "standard")
+	implementation(":standard:")
-	implementation(name: "starter")
+	implementation(":starter:")
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleVersions.java

@@ -34,18 +34,18 @@ public final class GradleVersions {
 
 	public static List<String> allCompatible() {
 		if (isJavaVersion(JavaVersion.VERSION_24)) {
-			return Arrays.asList(GradleVersion.current().getVersion(), "9.0.0-rc-2");
+			return Arrays.asList(GradleVersion.current().getVersion(), "9.0.0", "9.1.0-rc-1");
 		}
 		if (isJavaVersion(JavaVersion.VERSION_23)) {
-			return Arrays.asList(GradleVersion.current().getVersion(), "9.0.0-rc-2");
+			return Arrays.asList(GradleVersion.current().getVersion(), "9.0.0", "9.1.0-rc-1");
 		}
 		if (isJavaVersion(JavaVersion.VERSION_22)) {
-			return Arrays.asList("8.8", GradleVersion.current().getVersion(), "9.0.0-rc-2");
+			return Arrays.asList("8.8", GradleVersion.current().getVersion(), "9.0.0", "9.1.0-rc-1");
 		}
 		if (isJavaVersion(JavaVersion.VERSION_21)) {
-			return Arrays.asList("8.5", GradleVersion.current().getVersion(), "9.0.0-rc-2");
+			return Arrays.asList("8.5", GradleVersion.current().getVersion(), "9.0.0", "9.1.0-rc-1");
 		}
-		return Arrays.asList("7.6.6", "8.4", GradleVersion.current().getVersion(), "9.0.0-rc-2");
+		return Arrays.asList("7.6.6", "8.4", GradleVersion.current().getVersion(), "9.0.0", "9.1.0-rc-1");
 	}
 
 	public static String minimumCompatible() {