[actions] Quote the license.skip so windows system runs

Author: hazendaz

.github/workflows/ci.yaml

@@ -36,4 +36,4 @@ jobs:
         with:
           java-version: ${{ matrix.java }}
       - name: Test with Maven
-        run: ./mvnw test -B -Dlicense.skip=true
+        run: ./mvnw test -B -D"license.skip=true"