ci(build-image): 🧪 bump upload-artifact version

fix 🐛 error when downloading artifact with v4 that was uploaded with v3

https://github.com/marketplace/actions/download-a-build-artifact#breaking-changes

Author: MrDynamo

.github/workflows/master-beta-ci.yml

@@ -109,7 +109,7 @@ jobs:
 
             # Upload the digest as an artifact
             - name: Upload digest
-              uses: actions/upload-artifact@v3
+              uses: actions/upload-artifact@v4
               with:
                   name: digests_ghcr
                   path: /tmp/digests/*

.github/workflows/nightly-ci.yml

@@ -108,7 +108,7 @@ jobs:
 
       # Upload the digest to the artifacts
       - name: Upload digest
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: digests_ghcr
           path: /tmp/digests/*