ci: removing linkage-monitor from the required checks (#461)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/ce89d179-a8ad-4c3d-9e27-c395c59b8b3a/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Source-Link: googleapis/synthtool@e2aa5bc

Author: yoshi-automation

.github/workflows/ci.yaml

@@ -42,19 +42,6 @@ jobs:
         java-version: ${{matrix.java}}
     - run: java -version
     - run: .kokoro/dependencies.sh
-  linkage-monitor:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
-      with:
-        java-version: 8
-    - run: java -version
-    - name: Install artifacts to local Maven repository
-      run: .kokoro/build.sh
-      shell: bash
-    - name: Validate any conflicts with regard to com.google.cloud:libraries-bom (latest release)
-      uses: GoogleCloudPlatform/cloud-opensource-java/linkage-monitor@v1-linkagemonitor
   lint:
     runs-on: ubuntu-latest
     steps:

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-shared-dependencies.git",
-        "sha": "b28723ace0c27ebc73f23a2d094e0fe9ba8a9075"
+        "sha": "9998ae51ee4643c0834a3b7649912f65160d18d6"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "63cff634aabb85854caa511c5837ea6b45f42b4b"
+        "sha": "e2aa5bcc3356d9e3b8b53de3b5c86226447d3a22"
       }
     }
   ],