Update tests/artifacts/test-package/pyproject.toml

Co-authored-by: Michał Górny <[email protected]>

Author: DEKHTIARJonathan

tests/artifacts/test-package/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 requires = ["flit_core >=3.11,<4"]
-build-backend = 'flit_core.buildapi'
+build-backend = "flit_core.buildapi"
 
 [project]
 name = "test-package"