Update download artifact action

Author: bowbahdoe

.github/workflows/ci.yml

@@ -190,12 +190,12 @@ jobs:
           docker push javaplayground/$c
         done
     - name: Download backend
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: backend
         path: server/
     - name: Download frontend
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: frontend
         path: server/build/

ci/workflows.yml

@@ -285,13 +285,13 @@ workflows:
               done
 
           - name: "Download backend"
-            uses: actions/download-artifact@v3
+            uses: actions/download-artifact@v4
             with:
               name: backend
               path: server/
 
           - name: "Download frontend"
-            uses: actions/download-artifact@v3
+            uses: actions/download-artifact@v4
             with:
               name: frontend
               path: server/build/