Fix CI workflow

Author: gunndabad

.github/workflows/ci.yml

@@ -70,7 +70,7 @@ jobs:
         MINVERBUILDMETADATA: ${{ env.GITHUB_RUN_NUMBER }}
 
     - name: Publish package artifact
-      uses: actions/upload-artifact@v2-preview
+      uses: actions/upload-artifact@v4
       with:
         name: GovUk.Frontend.AspNetCore.nupkg
         path: src/GovUk.Frontend.AspNetCore/bin/Release/*.nupkg
@@ -85,7 +85,7 @@ jobs:
 
     steps:
     - name: Download package artifact
-      uses: actions/download-artifact@v4.1.7
+      uses: actions/download-artifact@v4
       with:
         name: GovUk.Frontend.AspNetCore.nupkg