Upgrade joda-time to 2.9.4

This commit upgrades joda-time to version 2.9.4 to integrate a bug fix
there into Elasticsearch.

Relates #18609

core/build.gradle

@@ -63,7 +63,7 @@ dependencies {
   compile 'com.carrotsearch:hppc:0.7.1'
 
   // time handling, remove with java 8 time
-  compile 'joda-time:joda-time:2.8.2'
+  compile 'joda-time:joda-time:2.9.4'
   // joda 2.0 moved to using volatile fields for datetime
   // When updating to a new version, make sure to update our copy of BaseDateTime
   compile 'org.joda:joda-convert:1.2'

distribution/licenses/joda-time-2.8.2.jar.sha1

@@ -1 +0,0 @@
-d27c24204c5e507b16fec01006b3d0f1ec42aed4

distribution/licenses/joda-time-2.9.4.jar.sha1

@@ -0,0 +1 @@
+1c295b462f16702ebe720bbb08f62e1ba80da41b

modules/lang-groovy/src/test/java/org/elasticsearch/script/groovy/GroovySecurityTests.java

@@ -44,12 +44,6 @@ public class GroovySecurityTests extends ESTestCase {
 
     private GroovyScriptEngineService se;
 
-    static {
-        // ensure we load all the timezones in the parent classloader with all permissions
-        // relates to https://github.com/elastic/elasticsearch/issues/14524
-        org.joda.time.DateTimeZone.getDefault();
-    }
-
     @Override
     public void setUp() throws Exception {
         super.setUp();