gh: update upload-artifact action to v4

Author: facchinm

.github/workflows/license_check.yml

@@ -15,7 +15,7 @@ jobs:
       with:
         directory-to-scan: 'scan/'
     - name: Artifact Upload
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: scancode
         path: ./artifacts

.github/workflows/package_core.yml

@@ -26,7 +26,7 @@ jobs:
           mv ../arduino-core-zephyr-llext* .
 
       - name: Archive core
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Core
           path: arduino-core-zephyr-llext*