Stop explicitly listing wheel as a build dependency

setuptools' get_requires_for_build_wheel() hook already injects this dependency
when building wheels is requested.

See also 64d8938.

pyproject.toml

@@ -41,7 +41,7 @@ Changelog = "https://pip.pypa.io/en/stable/news/"
 
 [build-system]
 # The lower bound is for <https://github.com/pypa/setuptools/issues/3865>.
-requires = ["setuptools>=67.6.1", "wheel"]
+requires = ["setuptools>=67.6.1"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]