build(java): update autorelease script (#373)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/8ae9af40-372e-4b53-9579-33a36c0aa209/targets

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

Source-Link: googleapis/synthtool@2414b81

java-core/.github/workflows/auto-release.yaml

@@ -4,7 +4,7 @@ name: auto-release
 jobs:
   approve:
     runs-on: ubuntu-latest
-    if: contains(github.head_ref, 'release-v')
+    if: contains(github.head_ref, 'release-please')
     steps:
     - uses: actions/github-script@v3
       with:
@@ -16,7 +16,7 @@ jobs:
             return;
           }
 
-          // only approve PRs like "chore: release <release version>"
+          // only approve PRs like "chore(master): release <release version>"
           if ( !context.payload.pull_request.title.startsWith("chore(master): release") ) {
             return;
           }

java-core/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-core.git",
-        "sha": "32797f6acc22874bb3144d76f214ff3a48aa65b5"
+        "sha": "313193509ee7fa0e694188f9266c54c029a582c6"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "692715c0f23a7bb3bfbbaa300f7620ddfa8c47e5"
+        "sha": "2414b817065726eae0bc525346c7e874f969369d"
       }
     }
   ],