added activation module

Author: dghgit

jmail/src/main/jdk1.9/module-info.java

@@ -3,6 +3,7 @@
     requires org.bouncycastle.provider;
     requires org.bouncycastle.pkix;
     requires jakarta.mail;
+    requires jakarta.activation;
 
     exports org.bouncycastle.mail.smime;
     exports org.bouncycastle.mail.smime.examples;