chore: Bump up httpx in template / generated pyproject.yaml BNCH-38599 (#117)

Author: daniel-deutsch-benchling

openapi_python_client/templates/pyproject.toml

@@ -14,7 +14,7 @@ include = ["CHANGELOG.md", "{{ package_name }}/py.typed"]
 
 [tool.poetry.dependencies]
 python = "^3.6"
-httpx = ">=0.15.4, <=0.22.0"
+httpx = ">=0.15.0, <=0.22.0"
 attrs = ">=20.1.0, <22.0"
 python-dateutil = "^2.8.0"