Merge pull request #25409 from wolfs

* gh-25409:
  Enable stricter validation for Gradle plugin

Closes gh-25409

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/build.gradle

@@ -64,6 +64,7 @@ task preparePluginValidationClasses(type: Copy) {
 
 validatePlugins {
 	classes.setFrom preparePluginValidationClasses
+	enableStricterValidation = true
 }
 
 task dependencyVersions(type: org.springframework.boot.build.constraints.ExtractVersionConstraints) {