Fix `import pymc.testing`

[bomtall]

Description

• Move import pytest to be local so it does not break import pymc.testing
• It is hard to write a test for this because the test will have pytest already

Related Issue

• [x ] Closes #7218
• [ ] Related to #

Checklist

• [x ] Checked that the pre-commit linting/style checks pass
• [ ] Included tests that prove the fix is effective or that the new feature works
• [ x] Added necessary documentation (docstrings and/or example notebooks)
• [ ] If you are a pro: each commit corresponds to a relevant logical change

Type of change

• [ ] New feature / enhancement
• [x ] Bug fix
• [ ] Documentation
• [ ] Maintenance
• [ ] Other (please specify):

---

📚 Documentation preview 📚: https://pymc--7357.org.readthedocs.build/en/7357/

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.37%. Comparing base (4f76576) to head (9bcc103). Report is 3 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/pymc-devs/pymc/pull/7357?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs) ```diff @@ Coverage Diff @@ ## main #7357 +/- ## ======================================= Coverage 92.37% 92.37% ======================================= Files 102 102 Lines 17207 17210 +3 ======================================= + Hits 15895 15898 +3 Misses 1312 1312 ``` | [Files](https://app.codecov.io/gh/pymc-devs/pymc/pull/7357?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs) | Coverage Δ | | |---|---|---| | [pymc/testing.py](https://app.codecov.io/gh/pymc-devs/pymc/pull/7357?src=pr&el=tree&filepath=pymc%2Ftesting.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs#diff-cHltYy90ZXN0aW5nLnB5) | `91.47% <100.00%> (+0.05%)` | :arrow_up: |

[welcome[bot]]

] Congrats on merging your first pull request! :tada: We here at PyMC are proud of you! :sparkling_heart: Thank you so much for your contribution :gift:

[twiecki]

Thanks!