fix: suggest PyPA build instead of pep517.build

Avoid deprecated load_module() in pkg_resources namespace delaration

fix typo

Fix a difference between the name of function definition and calling.

Fixes: https://github.com/pypa/setuptools/issues/2493

Avoid hitting network during test_virtualenv.test_test_command.

In test_test_command_install_requirements, uninstall setuptools to avoid getting some other version in the environment.

Replace incorrect statement about triggering installation of dependencies to indicate that the handling is mostly implementation specific. Ref pypa/setuptools#1471.

docs: recommend pypa build instead of pep517.build

Tests once again pass on an extract of the sdist.

Fix syntax in test_build_meta, version should not have quotes. Bug was masked by LegacyVersion parsing.

Adopt jaraco/skeleton

Fix tests with pytest 6.2