Don't use latest version of setuptools

Author: sbrunner

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "wheel"]
+requires = ["setuptools<81.0.0", "wheel"]
 
 [tool.black]
 line-length = 79

tox.ini

@@ -13,11 +13,15 @@ setenv =
 commands =
     python --version
     pytest {posargs:}
+deps =
+    setuptools<81.0.0
 
 [testenv:py311-cover]
 commands =
     python --version
     pytest --cov {posargs:}
+deps =
+    setuptools<81.0.0
 
 [testenv:lint]
 commands =
@@ -88,5 +92,5 @@ commands =
     # build wheel from sdist
     pip wheel -v --no-deps --no-index --no-build-isolation --wheel-dir {toxinidir}/dist --find-links {toxinidir}/dist deform
 deps =
-    setuptools
+    setuptools<81.0.0
     wheel