chore(java): remove pin on Apache Maven 3.8.1 from github actions

* chore(java): remove pin on Apache Maven 3.8.1 from github actions

[Ubuntu 20.04.3 LTS](https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-README.md) has updated the maven version to 3.8.3 which resolves[ the issue](googleapis/synthtool#1202) maven 3.8.2 had with flatten-maven-plugin

* chore: fix tests

Source-Author: Neenu Shaji <[email protected]>
Source-Date: Thu Nov 4 16:18:53 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 79d7936da1cf04ce1b4ead7d2c10dccccd852caf
Source-Link: googleapis/synthtool@79d7936

.github/workflows/ci.yaml

@@ -12,9 +12,6 @@ jobs:
         java: [8, 11, 17]
     steps:
     - uses: actions/checkout@v2
-    - uses: stCarolas/setup-maven@v4
-      with:
-        maven-version: 3.8.1
     - uses: actions/setup-java@v2
       with:
         distribution: zulu
@@ -27,9 +24,6 @@ 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@v2
       with:
         distribution: zulu
@@ -45,9 +39,6 @@ jobs:
         java: [8, 11, 17]
     steps:
     - uses: actions/checkout@v2
-    - uses: stCarolas/setup-maven@v4
-      with:
-        maven-version: 3.8.1
     - uses: actions/setup-java@v2
       with:
         distribution: zulu
@@ -58,9 +49,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: stCarolas/setup-maven@v4
-      with:
-        maven-version: 3.8.1
     - uses: actions/setup-java@v2
       with:
         distribution: zulu
@@ -73,14 +61,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: stCarolas/setup-maven@v4
-      with:
-        maven-version: 3.8.1
     - uses: actions/setup-java@v2
       with:
         distribution: zulu
         java-version: 8
     - run: java -version
     - run: .kokoro/build.sh
       env:
-        JOB_TYPE: clirr
+        JOB_TYPE: clirr

synth.metadata

@@ -11,7 +11,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "cb2755306975de4c54ea549c9deb25703b3731bb"
+        "sha": "79d7936da1cf04ce1b4ead7d2c10dccccd852caf"
       }
     }
   ],