[stubsabot] Bump braintree to 4.46.*

Release: https://pypi.org/pypi/braintree/4.46.0
Homepage: https://developer.paypal.com/braintree/docs/reference/overview
Repository: https://github.com/braintree/braintree_python
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/braintree
Diff: braintree/braintree_python@4.45.0...4.46.0

Stubsabot analysis of the diff between the two releases:
 - 1 public Python file has been added: `braintree/util/validation.py`.
 - 0 files included in typeshed's stubs have been deleted.
 - 8 files included in typeshed's stubs have been modified or renamed.
 - Total lines of Python code added: 333.
 - Total lines of Python code deleted: 47.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

Note that you will need to close and re-open the PR in order to trigger CI

Author: stubsabot

stubs/braintree/METADATA.toml

@@ -1,2 +1,2 @@
-version = "4.45.*"
+version = "4.46.*"
 upstream-repository = "https://github.com/braintree/braintree_python"