Update JAVA_HOME used for aarch64 CI jobs

.ci/java-versions-aarch64.properties

@@ -4,6 +4,6 @@
 # build and test Elasticsearch for this branch. Valid Java versions
 # are 'java' or 'openjdk' followed by the major release number.
 
-ES_BUILD_JAVA=adoptopenjdk15
-ES_RUNTIME_JAVA=adoptopenjdk11
+ES_BUILD_JAVA=jdk15
+ES_RUNTIME_JAVA=jdk15
 GRADLE_TASK=build