Upgrade GitHub Actions and improve workflow conditions

Updated GitHub Actions workflow to use version 4 of actions/checkout, actions/setup-java, and actions/upload-artifact. Adjusted conditions for job execution.

Author: thekeenant

.github/workflows/maven.yml

@@ -1,25 +1,33 @@
 name: Java CI with Maven
 on:
   push:
-    branches: "master"
+    branches: ["master"]
   pull_request_review:
-    branches: "master"
+    branches: ["master"]
     types: [submitted]
+
 jobs:
   build:
-    if: github.event_name == 'push' || github.event.review.state == 'approved'
+    if: github.event_name == 'push' || (github.event_name == 'pull_request_review' && github.event.review.state == 'approved')
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up JDK 17
-      uses: actions/setup-java@v3
-      with:
-        java-version: '17'
-        distribution: 'temurin'
-        cache: maven
-    - name: Build with Maven
-      run: mvn package
-    - uses: actions/upload-artifact@v3
-      with:
-        name: jar
-        path: target/madgrades-final*.jar
+      - name: Checkout repository
+        uses: actions/checkout@v4 
+      
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: maven
+          
+      - name: Build with Maven
+        run: mvn package
+        
+      - name: Upload JAR artifact
+        # Updated to v4
+        uses: actions/upload-artifact@v4 
+        with:
+          name: jar
+          path: target/madgrades-final*.jar
+          if-no-files-found: error