github: workflow: Update to actions/upload-artifact@v4

Signed-off-by: Janne Grunau <[email protected]>

Author: jannau

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Build
         run: make -k -j2 ARCH=aarch64-linux-gnu- CHAINLOADING=1
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: m1n1
           path: |