chore: Upgrade project dependencies for generated client BNCH-43401 (#137)

Author: bowenwr

openapi_python_client/templates/pyproject.toml

@@ -13,14 +13,14 @@ include = ["CHANGELOG.md", "{{ package_name }}/py.typed"]
 
 
 [tool.poetry.dependencies]
-python = "^3.6"
-httpx = ">=0.15.0, <=0.22.0"
+python = "^3.7"
+httpx = ">=0.23.0"
 attrs = ">=20.1.0, <22.0"
 python-dateutil = "^2.8.0"
 
 [tool.black]
 line-length = 120
-target_version = ['py36', 'py37', 'py38']
+target_version = ['py37', 'py38', 'py39']
 exclude = '''
 (
   /(