build: remove redundant wheel dep from pyproject.toml
build: remove redundant wheel dep from pyproject.toml

Remove the redundant `wheel` dependency, as it is added by the backend
automatically.  Listing it explicitly in the documentation was
a historical mistake and has been fixed since, see:
https://github.com/pypa/setuptools/commit/f7d30a9529378cf69054b5176249e5457aaf640a

nedbat/coveragepy,nedbat/coveragepy,nedbat/coveragepy,nedbat/coveragepy,nedbat/coveragepy