build(deps): bump phpgt/http from 1.3.7 to 1.3.8 (#669)

Bumps [phpgt/http](https://github.com/phpgt/Http) from 1.3.7 to 1.3.8.
- [Release notes](https://github.com/phpgt/Http/releases)
- [Commits](phpgt/Http@v1.3.7...v1.3.8)

---
updated-dependencies:
- dependency-name: phpgt/http
  dependency-version: 1.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]