build(java): update autorelease title check in response to the new mu…

…lti release branch changes (#945)

Source-Author: Stephanie Wang <stephaniewang526@users.noreply.github.com>
Source-Date: Wed Mar 10 14:40:03 2021 -0500
Source-Repo: googleapis/synthtool
Source-Sha: 0b064d767537e0675fc053e53fca473c5c701fb8
Source-Link: googleapis/synthtool@0b064d7

Co-authored-by: Thiago Nunes <thiagotnunes@google.com>

synth.metadata

@@ -351,4 +351,4 @@
     "renovate.json",
     "samples/pom.xml"
   ]
-}
+}