build(deps): bump phoenix from 1.6.2 to 1.6.4
build(deps): bump phoenix from 1.6.2 to 1.6.4

Bumps [phoenix](https://github.com/phoenixframework/phoenix) from 1.6.2 to 1.6.4.
- [Release notes](https://github.com/phoenixframework/phoenix/releases)
- [Changelog](https://github.com/phoenixframework/phoenix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/phoenixframework/phoenix/compare/v1.6.2...v1.6.4)

---
updated-dependencies:
- dependency-name: phoenix
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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