Update jakarta mail dependency to 1.6.4 (#47810)

This one contains a few small bugfixes, see https://eclipse-ee4j.github.io/mail/docs/CHANGES.txt

Author: spinscale

x-pack/plugin/watcher/build.gradle

@@ -34,7 +34,7 @@ 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
-    compile 'com.sun.mail:jakarta.mail:1.6.3'
+    compile 'com.sun.mail:jakarta.mail:1.6.4'
     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.mail-1.6.3.jar.sha1

@@ -0,0 +1 @@
+5015f335c2b974b1a7d08718edc326f0dc613c8a