chore(java): update windows build (#669)

to install maven 3.8.1 at runtime too (related to #1202)

Tested in [java-bigquerystorage](googleapis/java-bigquerystorage@7834f4f)

Source-Author: Stephanie Wang <stephaniewang526@users.noreply.github.com>
Source-Date: Tue Sep 7 13:04:27 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 17ee6e5c08f2eb47029beee4776ce990e56b3925
Source-Link: googleapis/synthtool@17ee6e5

.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

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-vision.git",
-        "sha": "1bb06b568b2084706df6ab30edf5f87d301e5f93"
+        "sha": "e2e1d311e5904d2b5a4663d3f4bc51d0a101933e"
       }
     },
     {
@@ -51,7 +51,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "ad7fd76e17bf9494a3e47ff9cf445f61564432e0"
+        "sha": "17ee6e5c08f2eb47029beee4776ce990e56b3925"
       }
     }
   ],