Update Gradle version to 9.6.1 to support JDK 25+

Author: AbdullinAM

buildSrc/src/main/kotlin/com/facebook/ktfmt/NativeImagePlugin.kt

@@ -62,7 +62,7 @@ class NativeImagePlugin : Plugin<Project> {
     val nativeImageDir = project.layout.projectDirectory.dir(NATIVE_IMAGE_SRC_DIR)
     val javaExtension = project.extensions.getByType<JavaPluginExtension>()
     val nativeImageSourceSet =
-        javaExtension.sourceSets.create("nativeImage") {
+        javaExtension.sourceSets.create("nativeImageSourceSet") {
           java.srcDir(nativeImageDir.dir("java"))
           resources.srcDir(nativeImageDir.dir("resources"))
         }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME