Update actions/upload-artifact action to v4

Author: renovate[bot]

.github/workflows/build.yml

@@ -120,7 +120,7 @@ jobs:
       - name: Build
         run: make kubectl-netcon-build
       - name: Upload
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: kubectl-netcon
           path: ./kubectl-netcon