Use setuptools >= 56.

Author: jarovo

pyproject.toml

@@ -48,7 +48,7 @@ Changelog = "https://www.pyinvoke.org/changelog.html"
 CI = "https://app.circleci.com/pipelines/github/pyinvoke/invoke"
 
 [build-system]
-requires = ["setuptools >= 77.0.3"]
+requires = ["setuptools >= 56.0.0"]
 build-backend = "setuptools.build_meta"
 
 [project.scripts]