Update to Gradle 8.1

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>

buildSrc/build.gradle

@@ -61,7 +61,7 @@ Properties props = VersionPropertiesLoader.loadBuildSrcVersion(project.file('ver
 version = props.getProperty("opensearch")
 
 def generateVersionProperties = tasks.register("generateVersionProperties", WriteProperties) {
-  outputFile = "${buildDir}/version.properties"
+  destinationFile = file("${buildDir}/version.properties")
   comment = 'Generated version properties'
   properties(props)
 }

gradle/wrapper/gradle-wrapper.properties

@@ -11,7 +11,7 @@
 
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-rc-1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionSha256Sum=47a5bfed9ef814f90f8debcbbb315e8e7c654109acd224595ea39fca95c5d4da
+distributionSha256Sum=8deb6070b6b84977e80e1605d4ac4f3a7fe6681e788f8295bc4d4f087dcdee30

gradlew

@@ -85,9 +85,6 @@ done
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -197,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in