upgrade Pex to 2.1.162

[cburroughs]

Changelogs:

• https://github.com/pantsbuild/pex/releases/tag/v2.1.160
• https://github.com/pantsbuild/pex/releases/tag/v2.1.161
• https://github.com/pantsbuild/pex/releases/tag/v2.1.162

Lockfile diff: 3rdparty/python/user_reqs.lock [python-default]

==                    Upgraded dependencies                     ==

  certifi                        2023.11.17   -->   2024.2.2
  cryptography                   41.0.7       -->   42.0.2
  pex                            2.1.159      -->   2.1.162
  pluggy                         1.3.0        -->   1.4.0
  pydantic                       1.10.13      -->   1.10.14
  python-dotenv                  1.0.0        -->   1.0.1
  urllib3                        2.1.0        -->   2.2.0

Further support relative to #15704
Fixes #20474

[WorkerPants]

I tried to automatically cherry-pick this change back to each relevant milestone, so that it is available in those older releases of Pants.

❌ 2.19.x

I was unable to cherry-pick this PR to 2.19.x, likely due to merge-conflicts.

Steps to Cherry-Pick locally

To resolve:

1. (Ensure your git working directory is clean)
2. Run the following script to reproduce the merge-conflicts:

   git fetch https://github.com/pantsbuild/pants main \
     && git fetch https://github.com/pantsbuild/pants 2.19.x \
     && git checkout -b cherry-pick-20496-to-2.19.x FETCH_HEAD \
     && git cherry-pick 30058b7cc99073a94eaf1a0eca88e85a7c59d0c4

3. Fix the merge conflicts and commit the changes
4. Run build-support/cherry_pick/make_pr.sh "20496" "2.19.x"

Please note that I cannot re-run CI if a job fails. Please work with your PR approver(s) to re-run CI if necessary.

---

When you're done manually cherry-picking, please remove the needs-cherrypick label on this PR.

Thanks again for your contributions!

🤖 Beep Boop here's my run link

[huonw]

(I marked this for cherry picking based on the discussion in #20463.)