Bump pydantic from 1.7.2 to 1.7.4

Bumps [pydantic](https://github.com/samuelcolvin/pydantic) from 1.7.2 to 1.7.4.
- [Release notes](https://github.com/samuelcolvin/pydantic/releases)
- [Changelog](https://github.com/samuelcolvin/pydantic/blob/master/HISTORY.md)
- [Commits](pydantic/pydantic@v1.7.2...v1.7.4)

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

requirements.txt

@@ -2,7 +2,7 @@ click==7.1.2
 fastapi==0.61.2
 h11==0.11.0
 httptools==0.5.0
-pydantic==1.7.2
+pydantic==1.7.4
 starlette==0.13.6
 uvicorn==0.12.3
 uvloop==0.17.0