[stubsabot] Bump braintree to 4.22.* (#10631)

Release: https://pypi.org/pypi/braintree/4.22.0
Homepage: https://developer.paypal.com/braintree/docs/reference/overview
Repository: https://github.com/braintree/braintree_python
Diff: https://github.com/braintree/braintree_python/compare/4.21.0...4.22.0

stubs/braintree/METADATA.toml

@@ -1,4 +1,4 @@
-version = "4.21.*"
+version = "4.22.*"
 upstream_repository = "https://github.com/braintree/braintree_python"
 partial_stub = true