Pex

This is a hotfix release that fixes the `--bdist-all` handling in the
`bdist_pex` distutils command that regressed in 2.1.43 to only create a
bdist for the first discovered entry point.

* Fix `--bdist-all` handling multiple console_scripts (1396)

This is a hotfix release that fixes env var collisions (introduced in
the Pex 2.1.43 release by 1367) that could occur when invoking Pex with
environment variables like `PEX_ROOT` defined.

* Fix Pip handling of internal env vars. (1388)

* Fix dist-info metadata discovery. (1376)
* Fix `--platform` resolve handling of env markers. (1367)
* Fix `--no-manylinux`. (1365)
* Allow `--platform` resolves for current interpreter. (1364)
* Do not suppress pex output in bdist_pex (1358)
* Warn for PEX env vars unsupported by venv. (1354)
* Fix execution modes. (1353)
* Fix Pex emitting warnings about its Pip PEX venv. (1351)
* Support more verbose output for interpreter info. (1347)
* Fix typo in recipes.rst (1342)

This release brings a bugfix for macOS interpreters when the
MACOSX_DEPLOYMENT_TARGET sysconfig variable is numeric as well as a
fix that improves Pip execution environment isolation.

* Fix MACOSX_DEPLOYMENT_TARGET handling. (1338)
* Better isolate Pip. (1339)

This release brings a hotfix from kaos for interpreter identification
on macOS 11.

* Update interpreter.py (1332)

This release brings proper support for pyenv shim interpreter
identification as well as a bug fix for venv mode.

* Fix Pex venv mode to respect `--strip-pex-env`. (1329)
* Fix pyenv shim identification. (1325)