Bump sniffio from 1.3.0 to 1.3.1 (#1866)

Bumps [sniffio](https://github.com/python-trio/sniffio) from 1.3.0 to 1.3.1.
- [Commits](python-trio/sniffio@v1.3.0...v1.3.1)

---
updated-dependencies:
- dependency-name: sniffio
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>