Replace javax activation with jakarta activation (elastic#40247)

The eclipse foundation has taken over the javax.activation dependency, which
resulted in a naming change of the dependency.

x-pack/plugin/watcher/build.gradle

@@ -35,11 +35,9 @@ dependencies {
 
     // watcher deps
     compile 'com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer:r239'
-    compile 'com.google.guava:guava:16.0.1' // needed by watcher for the html sanitizer and security tests for jimfs
+    compile 'com.google.guava:guava:16.0.1' // needed by watcher for the html sanitizer
     compile 'com.sun.mail:jakarta.mail:1.6.3'
-    // HACK: java 9 removed javax.activation from the default modules, so instead of trying to add modules, which would have
-    // to be conditionalized for java 8/9, we pull in the classes directly
-    compile 'javax.activation:activation:1.1.1'
+    compile 'com.sun.activation:jakarta.activation:1.2.1'
     compileOnly "org.apache.httpcomponents:httpclient:${versions.httpclient}"
     compileOnly "org.apache.httpcomponents:httpcore:${versions.httpcore}"
 

x-pack/plugin/watcher/licenses/jakarta.activation-1.2.1.jar.sha1

@@ -0,0 +1 @@
+8013606426a73d8ba6b568370877251e91a38b89

x-pack/plugin/watcher/licenses/jakarta.activation-LICENSE.txt

@@ -0,0 +1,29 @@
+
+    Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+      - Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+      - Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+
+      - Neither the name of the Eclipse Foundation, Inc. nor the names of its
+        contributors may be used to endorse or promote products derived
+        from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+    IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+    PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.