build(deps-dev): bump httpx from 0.21.1 to 0.21.3

Bumps [httpx](https://github.com/encode/httpx) from 0.21.1 to 0.21.3.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.21.1...0.21.3)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -66,7 +66,7 @@ pytest-mock = "^3.6.1"
 pytest-lazy-fixture = "^0.6.3"
 fastapi = ">=0.6.3"
 fastapi-crudrouter = ">=0.8.4"
-httpx = "^0.21.1"
+httpx = "^0.21.3"
 pytest-env = "^0.6.2"
 pytest-mockservers = "^0.6.0"
 pytest-xdist = "^2.5.0"