Revert "Missed some to downgrade"

This reverts commit bca262b.

Author: tomkennedy513

.github/actions/imgpkg-push/action.yml

@@ -76,7 +76,7 @@ runs:
       cat ${{ inputs.bundle_output }}
 
   - name: Upload Bundle lock
-    uses: actions/upload-artifact@v3
+    uses: actions/upload-artifact@v4
     with:
       name: ${{ inputs.bundle_output }}
       path: ${{ inputs.bundle_output }}

.github/actions/pack-build/action.yml

@@ -58,7 +58,7 @@ runs:
       echo "image=$(cat images/$name)" >> $GITHUB_OUTPUT
       cat images/$name
   - name: Upload Image Artifacts
-    uses: actions/upload-artifact@v3
+    uses: actions/upload-artifact@v4
     with:
       name: ${{ inputs.artifact_name }}
       path: images/