Bump the uv group across 2 directories with 1 update

Bumps the uv group with 1 update in the /mcp-client-python directory: [httpx2](https://github.com/pydantic/httpx2).
Bumps the uv group with 1 update in the /weather-server-python directory: [httpx2](https://github.com/pydantic/httpx2).


Updates `httpx2` from 2.9.1 to 2.12.0
- [Release notes](https://github.com/pydantic/httpx2/releases)
- [Changelog](https://github.com/pydantic/httpx2/blob/main/src/httpx2/CHANGELOG.md)
- [Commits](https://github.com/pydantic/httpx2/compare/v2.9.1...v2.12.0)

Updates `httpx2` from 2.9.1 to 2.12.0
- [Release notes](https://github.com/pydantic/httpx2/releases)
- [Changelog](https://github.com/pydantic/httpx2/blob/main/src/httpx2/CHANGELOG.md)
- [Commits](https://github.com/pydantic/httpx2/compare/v2.9.1...v2.12.0)

---
updated-dependencies:
- dependency-name: httpx2
  dependency-version: 2.12.0
  dependency-type: indirect
  dependency-group: uv
- dependency-name: httpx2
  dependency-version: 2.12.0
  dependency-type: direct:production
  dependency-group: uv
...

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

weather-server-python/pyproject.toml

@@ -7,7 +7,7 @@ requires-python = ">=3.10"
 # httpx2, not httpx: `mcp` already depends on httpx2, so adding httpx would
 # install a second HTTP stack alongside it.
 dependencies = [
-    "httpx2>=2.5.0",
+    "httpx2>=2.12.0",
     "mcp[cli]>=2.0.0",
     # weather.py imports BaseModel, Field, and RootModel directly. RootModel is v2-only.
     "pydantic>=2.0.0",