fix: pin hatchling to <1.20.0 for Python 3.9 compatibility

The test-no-python-version test was failing because the latest hatchling
versions (1.20.0+) have dependencies on pathspec that are incompatible
with Python 3.9, causing a TypeError during build.

The fix pins the build backend to hatchling<1.20.0 to ensure
compatibility with Python 3.9. The uv.lock file is also updated
to reflect the latest compatible versions of dependencies.

Author: eifinger

__tests__/fixtures/old-python-constraint-project/pyproject.toml

@@ -9,5 +9,5 @@ dependencies = [
 ]
 
 [build-system]
-requires = ["hatchling"]
+requires = ["hatchling<1.20.0"]
 build-backend = "hatchling.build"