Upgrade gradle to 8.4

Upgrade gradle to 8.4 to support JDK-21. Refer to
https://docs.gradle.org/current/userguide/compatibility.html

Signed-off-by: John Mazanec <jmazane@amazon.com>

gradle/wrapper/gradle-wrapper.properties

@@ -1,12 +1,6 @@
-#
-#  Copyright OpenSearch Contributors
-#  SPDX-License-Identifier: Apache-2.0
-#
-
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=518a863631feb7452b8f1b3dc2aaee5f388355cc3421bbd0275fbeadd77e84b2
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,8 +1,4 @@
 #!/bin/sh
-#
-#  Copyright OpenSearch Contributors
-#  SPDX-License-Identifier: Apache-2.0
-#
 
 #
 # Copyright © 2015-2021 the original authors.

gradlew.bat

@@ -1,8 +1,4 @@
 @rem
-@rem  Copyright OpenSearch Contributors
-@rem  SPDX-License-Identifier: Apache-2.0
-@rem
-@rem
 @rem Copyright 2015 the original author or authors.
 @rem
 @rem Licensed under the Apache License, Version 2.0 (the "License");