Make sure that the order of Requires-Dist does not matter

Fixes: tox-dev#77

tests/test_frontend_setuptools.py

@@ -75,7 +75,7 @@ def test_setuptools_prepare_metadata_for_build_wheel(frontend_setuptools: Subpro
     assert dist.metadata["Name"] == "demo"
     values = [v for k, v in dist.metadata.items() if k == "Requires-Dist"]  # type: ignore[attr-defined]
     # ignore because "PackageMetadata" has no attribute "items"
-    assert values == ["requests >2", "magic >3"]
+    assert sorted(values) == ["magic >3", "requests >2"]
     assert isinstance(result.out, str)
     assert isinstance(result.err, str)