Update httpx requirement from <0.28 to <0.29

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@0.0.1...0.28.0)

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

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

pyproject.toml

@@ -196,7 +196,7 @@ service = [
 ]
 test = [
   "cratedb-toolkit[testing]",
-  "httpx<0.28",
+  "httpx<0.29",
   "pueblo[dataframe]",
   "pytest<9",
   "pytest-cov<7",