Merge pull request #225 from sethmlarson/pin-github-actions

Pin GitHub Actions and Python packages

Merge pull request #210 from henryiii/henryiii/chore/subprocess.run

chore: add a note about the exception object having the output

Apply suggestions from code review

chore: use subprocess.run instead of old check_*

Merge pull request #212 from kulikjak/fix-find_distributions

Merge pull request #219 from bbhtt/bbhtt/show-traceback-outputjson

add test for find_distributions

Update src/pyproject_hooks/_in_process/_in_process.py

Fix find_distributions with non-empty context

Show traceback from output.json on BackendUnavailable

Merge pull request #220 from SpecLad/pep-639

Switch license metadata to the PEP 639 format

Merge pull request #222 from sethmlarson/patch-2