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

…lti release branch changes (#569)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/ea9e8f58-82b4-4fb6-8ab3-642c040c0e6a/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@0b064d7

.github/workflows/auto-release.yaml

@@ -16,8 +16,8 @@ jobs:
             return;
           }
 
-          // only approve PRs like "chore(master): release <release version>"
-          if ( !context.payload.pull_request.title.startsWith("chore(master): release") ) {
+          // only approve PRs like "chore: release <release version>"
+          if ( !context.payload.pull_request.title.startsWith("chore: release") ) {
             return;
           }
 

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-firestore.git",
-        "sha": "52c6d1da01b2e5705c6c7511157d7e9a18cb33e1"
+        "sha": "7370d21994126d206f51a8c0c1677b5dc0ee030f"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d0bdade9a962042dc0f770cf631086f3db59b5b0"
+        "sha": "0b064d767537e0675fc053e53fca473c5c701fb8"
       }
     }
   ],