Pex

This release fixes an oversight in lock file use against secured custom
indexes and find links repos. Previously credentials were passed during
the lock creation process via either `~/.netrc` or via embedded
credentials in the custom indexes and find links URLs Pex was configured
with. But, at lock use time, these credentials were not used. Now
`~/.netrc` entries are always used and embedded credentials passed via
custom URLS at lock creation time can be passed in the same manner at
lock use time.

* Support credentials in URLFetcher. (1754)

This PyCon US 2022 release brings full support for Python interpreter
emulation when a PEX is run in interpreter mode (without an entry point
or else when forced via `PEX_INTERPRETER=1`).

A special thank you to Loren Arthur for contributing the fix in the
Pantsbuild sprint at PyCon.

* PEX interpreters should support all underlying Python interpreter
options. (1745)

This release fixes a bug creating a PEX from a `--lock` when pre-release
versions are involved.

* Fix `--lock` handling of pre-release versions. (1742)

This releases fixes a bug creating `--style universal` locks with
`--interpreter-constraint` configured when the ambient interpreter does
not match the constraints and the resolved lock includes sdist primary
artifacts.

* Fix universal lock creation for ICs. (1738)

This is a hotfix release for a regression in prerelease version handling
introduced in the 2.1.81 release by 1727.

* Fix prerelease handling when checking resolves. (1732)

This release brings a fix to Pex resolve checking for distributions
built by setuptools whose `Requires-Dist` metadata does not match a
distibutions project name exactly (i.e.: no PEP-503 `[._-]`
normalization was performed).

* Fix Pex resolve checking. (1727)