chore(ci): add missing @test annotation

Author: josecorella

src/test/java/com/amazonaws/encryptionsdk/internal/DecryptionHandlerTest.java

@@ -642,7 +642,8 @@ public void withNoMaxEdks() {
     final byte[] plaintext = new byte[plaintextLen];
     decryptionHandler.processBytes(header, 0, header.length, plaintext, 0);
   }
-
+  
+  @Test
   public void validSignatureAcrossMultipleBlocks() {
     byte[] ciphertext =
         getTestMessage(