Bump httpx from 0.17.1 to 0.23.0

Bumps [httpx](https://github.com/encode/httpx) from 0.17.1 to 0.23.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.17.1...0.23.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -6,7 +6,7 @@ redis==3.5.3
 uvloop==0.15.2
 jinja2==2.11.3
 aiofiles==0.6.0
-httpx==0.17.1
+httpx==0.23.0
 itsdangerous==1.1.0
 databases[sqlite]==0.4.3
 sqlalchemy==1.3.0