Bump httpx from 0.13.3 to 0.26.0

Bumps [httpx](https://github.com/encode/httpx) from 0.13.3 to 0.26.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](https://github.com/encode/httpx/compare/0.13.3...0.26.0)

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

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

requirements.txt

@@ -20,7 +20,7 @@ h2==3.2.0
 hpack==4.0.0
 hstspreload==2024.1.5
 httpcore==0.9.1
-httpx==0.13.3
+httpx==0.26.0
 hyperframe==5.2.0
 idna==2.10
 importlib-metadata==7.0.1