build: Define multiple files

Author: OleRoss

.github/workflows/test_and_publish.yml

@@ -49,7 +49,7 @@ jobs:
         name: Set .csproj versions
         uses: vers-one/dotnet-project-version-updater@v1.7
         with:
-          file: "src/**/*.csproj"
+          files: "src/**/*.csproj"
           version: ${{ steps.semantic.outputs.new_release_version }}
 
       - if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.semantic.outputs.new_release_published == 'true'