Bump insta from 1.38.0 to 1.39.0

Bumps [insta](https://github.com/mitsuhiko/insta) from 1.38.0 to 1.39.0.
- [Release notes](https://github.com/mitsuhiko/insta/releases)
- [Changelog](https://github.com/mitsuhiko/insta/blob/master/CHANGELOG.md)
- [Commits](mitsuhiko/insta@1.38.0...1.39.0)

---
updated-dependencies:
- dependency-name: insta
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>