Update faker requirement from ~=13.4.0 to ~=13.6.0 in /api

Updates the requirements on [faker](https://github.com/joke2k/faker) to permit the latest version.
- [Release notes](https://github.com/joke2k/faker/releases)
- [Changelog](https://github.com/joke2k/faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/joke2k/faker/compare/v13.4.0...v13.6.0)

---
updated-dependencies:
- dependency-name: faker
  dependency-type: direct:production
...

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

api/requirements.txt

@@ -11,6 +11,6 @@ bcrypt==3.2.0
 pytest~=7.1.2
 pytest-cov
 marshmallow~=3.15.0
-faker~=13.4.0
+faker~=13.6.0
 yfinance~=0.1.70
 requests~=2.27.1