Bump httpx from 0.13.3 to 0.23.0 in /api

Bumps [httpx](https://github.com/encode/httpx) from 0.13.3 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@0.13.3...0.23.0)

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

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

Author: dependabot[bot]

api/requirements.txt

@@ -32,7 +32,7 @@ h2==3.2.0
 hpack==3.0.0
 hstspreload==2023.1.1
 httpcore==0.9.1
-httpx==0.13.3
+httpx==0.23.0
 hydralit-components==1.0.10
 hyperframe==5.2.0
 idna==2.10