Pex

This release fixes `pex3 lock create` to handle relative `--tmpdir`.

* Fix lock save detection to be more robust. (1760)

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)