Update pytest-httpx requirement in the dependencies group

Updates the requirements on [pytest-httpx](https://github.com/Colin-b/pytest_httpx) to permit the latest version.

Updates `pytest-httpx` to 0.32.0
- [Release notes](https://github.com/Colin-b/pytest_httpx/releases)
- [Changelog](https://github.com/Colin-b/pytest_httpx/blob/develop/CHANGELOG.md)
- [Commits](Colin-b/pytest_httpx@v0.31.1...v0.32.0)

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

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

pyproject.toml

@@ -53,7 +53,7 @@ graph = [
 testing = [
     "pytest~=8.2",
     "pytest-cov~=5.0",
-    "pytest-httpx~=0.31.1",
+    "pytest-httpx>=0.31.1,<0.33.0",
     "requests-mock~=1.12",
     "soft7[graph]",
 ]