Bump httpx from 0.24.1 to 0.25.0

Bumps [httpx](https://github.com/encode/httpx) from 0.24.1 to 0.25.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.24.1...0.25.0)

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

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

requirements-dev.txt

@@ -2,4 +2,4 @@ flake8
 mongomock
 pytest
 requests-mock
-httpx==0.24.1
+httpx==0.25.0