Update ci.yaml

Author: kazuki43zoo

.github/workflows/ci.yaml

@@ -36,6 +36,6 @@ jobs:
         uses: actions/setup-java@v2
         with:
           java-version: ${{ matrix.java }}
-           distribution: ${{ matrix.distribution }}
+          distribution: ${{ matrix.distribution }}
       - name: Test with Maven
         run: ./mvnw test -B -D"license.skip=true"