Bump postgrex from 0.17.3 to 0.17.4 (#1194)

Bumps [postgrex](https://github.com/elixir-ecto/postgrex) from 0.17.3 to 0.17.4.
- [Release notes](https://github.com/elixir-ecto/postgrex/releases)
- [Changelog](https://github.com/elixir-ecto/postgrex/blob/master/CHANGELOG.md)
- [Commits](elixir-ecto/postgrex@v0.17.3...v0.17.4)

---
updated-dependencies:
- dependency-name: postgrex
  dependency-type: direct:production
  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>
Co-authored-by: TraceyOnim <[email protected]>