release: 2.19.22

[talsperre]

Summary

• Bump metaflow version to 2.19.22

Test plan

• Verify version string is correct in metaflow/version.py
• CI passes

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR bumps the Metaflow version from 2.19.21 to 2.19.22 and improves the stub-testing CI workflow to accommodate a breaking change in pytest-mypy-plugins v4, which dropped support for Python < 3.10.

• metaflow/version.py: Patch version incremented to 2.19.22.
• .github/workflows/test-stubs.yml: Conditional installation of pytest-mypy-plugins>=4 for Python 3.10+ and pytest-mypy-plugins<4 for older Python versions. The --mypy-only-local-stub pytest flag is now also conditionally applied only for Python < 3.10, aligning with the capabilities of the respective plugin versions.

Confidence Score: 5/5

• This PR is safe to merge — it is a straightforward patch release bump with a targeted CI compatibility fix.
• Both changes are minimal and well-scoped: the version bump is a single-line string change, and the workflow update correctly handles the pytest-mypy-plugins v4 API split using proper shell conditionals. No logic errors, security concerns, or regressions were identified.
• No files require special attention.

Important Files Changed

Filename	Overview
metaflow/version.py	Simple patch version bump from 2.19.21 to 2.19.22 — no issues found.
.github/workflows/test-stubs.yml	Adds conditional logic to install pytest-mypy-plugins>=4 for Python 3.10+ and <4 for older versions, and conditionally applies --mypy-only-local-stub only for Python < 3.10. Logic and syntax are correct.

_{Last reviewed commit: "fix: handle pytest-m..."}