Update pytest-httpx requirement from ^0.28.0 to ^0.29.0 (#14)

Updates the requirements on [pytest-httpx](https://github.com/Colin-b/pytest_httpx) to permit the latest version.
- [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@v0.28.0...v0.29.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -44,7 +44,7 @@ optional = true
 [tool.poetry.group.tests.dependencies]
 pytest = "^7.3.0"
 pytest-cov = "^4.0.0"
-pytest-httpx = "^0.28.0"
+pytest-httpx = "^0.29.0"
 pytest-mock = "^3.12.0"
 # Optional build requirements