gradle: upgrade to 9.3.1 to support java 25

Fix: Issue #173

Author: cfig

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

tools/work_from_China.diff

@@ -44,8 +44,8 @@ index 8049c68..2e33ce8 100644
 @@ -1,5 +1,5 @@
  distributionBase=GRADLE_USER_HOME
  distributionPath=wrapper/dists
--distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
-+distributionUrl=https\://mirrors.cloud.tencent.com/gradle/gradle-7.6-bin.zip
+-distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-bin.zip
++distributionUrl=https\://mirrors.cloud.tencent.com/gradle/gradle-9.3.1-bin.zip
  zipStoreBase=GRADLE_USER_HOME
  zipStorePath=wrapper/dists
 diff --git a/helper/build.gradle.kts b/helper/build.gradle.kts