build(deps-dev): update httpx requirement

Updates the requirements on [httpx](https://github.com/encode/httpx) to permit the latest version.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.24.1...0.26.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -22,7 +22,7 @@ pytest-cov = ">=3,<5"
 pytest-asyncio = ">=0.21.1,<0.24.0"
 mypy = ">=0.971,<2.0"
 tox = ">=3.26,<5.0"
-httpx = ">=0.24.1,<0.26.0"
+httpx = ">=0.24.1,<0.27.0"
 ruff = ">=0.0.284,<0.2.0"
 
 [tool.ruff]