Pex

artifacts via re-directs, the resulting lock file would contain the
final re-directed URL instead of the originating index artifact URL.
This could lead to issues when the indexes re-direction scheme changed
or else if authentication parameters in the original index URL were
stripped in the Pip logs.

* Fix artifact URL recording for `pip>=23.3`. (2421)

__pex__` import hook.

* Eliminate warnings for default use. (2188)
* Cleanup sys.path after __pex__ is imported. (2189)

can't. To turn the need to fall back to older Pip from a warning into a
hard error you can also specify `--no-allow-pip-version-fallback`.

The `pex3 lock update` command now gains the ability to update just the
index and find links repos the lock's artifacts originate from by using
a combination of `--no-pypi`, `--index` & `--find-links` along with
`--pin` to ensure the project versions stay pinned as they are in the
lockfile and just the repos they are downloaded from is altered. Consult
the CLI `--help` for `--fingerprint-mismatch {ignore,warn,error}` to
gain more control over repo migration behavior.

There are several bug fixes as well dealing with somewhat esoteric
corner cases involving changing a PEX `--layout` from one form to
another and building artifacts using certain interpreters on macOS 11.0
(aka: 10.16).

* Add support for Pip 22.2.2. (1893)
* Make lock update sensitive to artifacts. (1887)
* Ensure locally built wheel is consumable locally. (1886)
* Ensure `--output` always overwrites destination. (1883)

This release fixes `PEX_TOOLS=1 ./path/to/pex` for PEXes using venv-execution and sh-bootstrapping (that is, built with `--sh-boot --venv=... --include-tools` ). Previously, the `PEX_TOOLS=1` was ignored if the venv already existed in the `PEX_ROOT` (for instance, if the PEX had already been run).

* Avoid fast-path in `--sh-boot` script when `PEX_TOOLS=1`. (2726)

Fix PEP-723 script metadata parsing to skip metadata blocks found in multiline strings.

* Fix PEP-723 script metadata parsing. (2722)

This release fixes rate limit issues building CPython Pex scies by bumping to science 0.12.2 which
is fixed to properly support bearer authentication via the `SCIENCE_AUTH_<normalized_host>_BEARER`
environment variable.

* Upgrade to `science` 0.12.2 to fix PBS rate limits. (2720)