changes without context (googleapis#605)

autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

.github/workflows/ci.yaml

@@ -26,9 +26,6 @@ jobs:
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: stCarolas/setup-maven@v4
-      with:
-        maven-version: 3.8.1
     - uses: actions/setup-java@v1
       with:
         java-version: 8