test: Fix e2e test with new httpx versions

Author: dbanty

end_to_end_tests/golden-record/pyproject.toml

@@ -14,7 +14,7 @@ include = ["CHANGELOG.md", "my_test_api_client/py.typed"]
 
 [tool.poetry.dependencies]
 python = "^3.6"
-httpx = ">=0.15.4,<0.18.2"
+httpx = ">=0.15.4,<0.19.0"
 attrs = "^20.1.0"
 python-dateutil = "^2.8.0"