Update cover-baseline.yml

fix java version

.github/workflows/cover-baseline.yml

@@ -11,6 +11,9 @@ concurrency:
 jobs:
   Test:
     runs-on: ubuntu-22.04
+    strategy:
+    matrix:
+    java: [ '17' ]
     env:
       JVM_ARGS: -Xmx8192m
     steps:
@@ -18,6 +21,12 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Set up JDK ${{matrix.java}}
+        uses: actions/setup-java@v2
+        with:
+          java-version: ${{matrix.java}}
+          distribution: 'adopt'
+          cache: maven
       - name: Compile project
         run: mvn --batch-mode --no-transfer-progress clean compile
       - name: Download Diffblue Cover