Bump importlib-metadata from 4.11.4 to 4.12.0 in /dependencies/default (#378)

Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 4.11.4 to 4.12.0.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/CHANGES.rst)
- [Commits](python/importlib_metadata@v4.11.4...v4.12.0)

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

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

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

Author: dependabot[bot]

dependencies/default/constraints.txt

@@ -4,7 +4,7 @@ coverage==6.4.1
 flaky==3.7.0
 hypothesis==6.48.0
 idna==3.3
-importlib-metadata==4.11.4
+importlib-metadata==4.12.0
 iniconfig==1.1.1
 mypy==0.961
 mypy-extensions==0.4.3