v1.4.0

• The versions of pip and pip-licenses used to build the embedded environment are now user-configurable via the pip_version and pip_licenses_version recipe options. If not given, they default to pip==21.2.4 and pip-licenses==3.5.3.
• Fixed issue with pip-licenses being incompatible with the newest pip version
• Fixed libffi segfault on macOS: use CPython built-in libffi instead of the Conan version