build(java): use yoshi-approver token for auto-approve (#228)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/05076b1a-1cfb-43b3-b64d-9a6221da0e04/targets

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Source-Link: googleapis/synthtool@916c10e

.github/workflows/auto-release.yaml

@@ -7,7 +7,7 @@ jobs:
     steps:
     - uses: actions/github-script@v3.0.0
       with:
-        github-token: ${{secrets.GITHUB_TOKEN}}
+        github-token: ${{secrets.YOSHI_APPROVER_TOKEN}}
         debug: true
         script: |
           // only approve PRs from release-please[bot]
@@ -66,4 +66,4 @@ jobs:
             repo: context.repo.repo,
             issue_number: context.payload.pull_request.number,
             labels: ['kokoro:force-run', 'automerge']
-          });
+          });

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-websecurityscanner.git",
-        "sha": "b2ce27ddd8870b47d0cfdc41d8d8993f5dea02d9"
+        "sha": "cdd95a824f43a4fae78597c9b52691a3a537b248"
       }
     },
     {
@@ -35,7 +35,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "80003a3de2d8a75f5b47cb2e77e018f7f0f776cc"
+        "sha": "916c10e8581804df2b48a0f0457d848f3faa582e"
       }
     }
   ],