Update java-versions.properties

Signed-off-by: Andrew Ross <[email protected]>

Author: andrross

.ci/java-versions.properties

@@ -14,7 +14,7 @@
 # are 'java' or 'openjdk' followed by the major release number.
 
 # See please https://docs.gradle.org/8.10/userguide/upgrading_version_8.html#minimum_daemon_jvm_version
-OPENSEARCH_BUILD_JAVA=openjdk17
-OPENSEARCH_RUNTIME_JAVA=java11
+OPENSEARCH_BUILD_JAVA=openjdk21
+OPENSEARCH_RUNTIME_JAVA=java21
 GRADLE_TASK=build
 GRADLE_EXTRA_ARGS=