Update ci.yml

changed ci.yml to use v4 artifacts
https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: reserve85

.github/workflows/ci.yml

@@ -85,7 +85,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"          
       - name: Upload digest
         if: github.event_name != 'pull_request'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: digests
           path: /tmp/digests/*
@@ -102,7 +102,7 @@ jobs:
       - build
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: digests
           path: /tmp/digests