Remove redundant wheel dep from pyproject.toml

Apparently, the wheel dependency is redundant as setuptools will always
ensure wheel is installed. In fact, the documentation has been updated
to reflect that in pypa/setuptools@f7d30a9.

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 # Minimum requirements for the build system to execute.
-requires = ["setuptools>=61.2", "wheel"]
+requires = ["setuptools>=61.2"]
 build-backend = "setuptools.build_meta"
 
 [project]