fix(sdk/python): add httpcore>=1.0.8 for Python 3.14 compatibility

httpcore <1.0.8 crashes on Python 3.14 because it tries to setattr
__module__ on a typing.Union object, which is no longer supported
after the Union/UnionType merge. Adding a direct lower-bound constraint
ensures the fix propagates to module runtime containers, where the
SDK's uv.lock is not used.

Refs: encode/httpcore#1005

Signed-off-by: Yves Brissaud <yves@dagger.io>

Author: eunomie

sdk/python/pyproject.toml

@@ -30,6 +30,7 @@ dependencies = [
     "anyio>=3.6.2",
     "cattrs>=25.1.0",
     "gql[httpx]>=4.0",
+    "httpcore>=1.0.8",
     "beartype>=0.22.0",
     "platformdirs>=2.6.2",
     "typing_extensions>=4.13.0",