Bump setup-java action from v1 to v4

Author: C0urante

.github/workflows/pull_request.yml

@@ -19,8 +19,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Set up JDK 8
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v4
         with:
+          distribution: 'adopt'
           java-version: 8
           cache: maven
       - name: Build (Maven)