chore(deps-dev): Bump the dev-dependencies group with 3 updates (#784)

Bumps the dev-dependencies group with 3 updates: [ash_graphql](https://github.com/ash-project/ash_graphql), [mimic](https://github.com/edgurgel/mimic) and [plug_cowboy](https://github.com/elixir-plug/plug_cowboy).


Updates `ash_graphql` from 1.3.3 to 1.3.4
- [Changelog](https://github.com/ash-project/ash_graphql/blob/main/CHANGELOG.md)
- [Commits](ash-project/ash_graphql@v1.3.3...v1.3.4)

Updates `mimic` from 1.10.0 to 1.10.1
- [Release notes](https://github.com/edgurgel/mimic/releases)
- [Commits](edgurgel/mimic@v1.10.0...v1.10.1)

Updates `plug_cowboy` from 2.7.1 to 2.7.2
- [Changelog](https://github.com/elixir-plug/plug_cowboy/blob/master/CHANGELOG.md)
- [Commits](elixir-plug/plug_cowboy@v2.7.1...v2.7.2)

---
updated-dependencies:
- dependency-name: ash_graphql
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: mimic
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: plug_cowboy
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

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