Upgrade actions.

Author: tecimovic

.github/workflows/gradle.yml

@@ -15,9 +15,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up JDK 1.9
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v4
       with:
         java-version: 1.9
     - name: Grant execute permission for gradlew
@@ -27,12 +27,12 @@ jobs:
     - name: Gradle test
       run: ./gradlew test
     - name: Archive jar file
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: java-pcap
         path: pcap/build/libs/java-pcap-*.jar
     - name: Archive license file
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: java-pcap
         path: LICENSE.txt