build(java): use actions/github-script v3 tag rather than full semver (#1186)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/ae7b09a4-b636-4a61-997a-6394f4c00dbd/targets

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Source-Link: googleapis/synthtool@7fcc405

Author: yoshi-automation

.github/workflows/approve-readme.yaml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository_owner == 'googleapis' && github.head_ref == 'autosynth-readme'
     steps:
-      - uses: actions/github-script@v3.0.0
+      - uses: actions/github-script@v3
         with:
           github-token: ${{secrets.YOSHI_APPROVER_TOKEN}}
           script: |

.github/workflows/auto-release.yaml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     if: contains(github.head_ref, 'release-v')
     steps:
-    - uses: actions/github-script@v3.0.0
+    - uses: actions/github-script@v3
       with:
         github-token: ${{secrets.YOSHI_APPROVER_TOKEN}}
         debug: true

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-http-java-client.git",
-        "sha": "1e7a484ab95affae970815f4b72d2965a8a9e0e8"
+        "sha": "ba3c2bcb01e087560d0afea5f7b671046c6016cd"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "7d652819519dfa24da9e14548232e4aaba71a11c"
+        "sha": "7fcc405a579d5d53a726ff3da1b7c8c08f0f2d58"
       }
     }
   ],