pyproject.toml: Upgrade setuptools for Python 3.12 beta 1

Related to numpy#23808

https://www.python.org/download/pre-releases
https://docs.python.org/3.12/whatsnew/3.12.html

Author: cclauss

pyproject.toml

@@ -4,7 +4,7 @@
 #build-backend = "mesonpy"
 requires = [
     # setuptools, wheel and Cython are needed for the setup.py based build
-    "setuptools==59.2.0",
+    "setuptools==67.8.0",
     # `wheel` is needed for non-isolated builds, given that `meson-python`
     # doesn't list it as a runtime requirement (at least in 0.11.0) - it's
     # likely to be removed as a dependency in meson-python 0.12.0.