[github] update to v4 upload

Author: okay

.github/workflows/pr.yml

@@ -19,7 +19,7 @@ jobs:
           CROSS_TC=arm-kobo-linux-gnueabihf DOCKERFILE=Dockerfile.kobo FBINK=1 TARGET=kobo make docker
           TARGET=rm make docker
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: artifacts
           path: artifacts/

.github/workflows/stable-release.yml

@@ -67,7 +67,7 @@ jobs:
 
       - name: Upload artifacts
         if: ${{ env.ssh_host == '' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: artifacts
           path: artifacts/