chore(java): update windows build (#1205)

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-java:latest
-  digest: sha256:4837f2a7fdff2985b4f7432f8a6d6a87beacebf3ac071746532c0ce2e3f24b9b
+  digest: sha256:a9e9c43309df91d0051ccfcea4860a95bbe9a85eeb3c1822fa1a617a06b649de

.github/workflows/ci.yaml

@@ -26,6 +26,9 @@ 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
@@ -75,4 +78,4 @@ jobs:
     - run: java -version
     - run: .kokoro/build.sh
       env:
-        JOB_TYPE: clirr
+        JOB_TYPE: clirr