Fix Python type checking (#487)

* Enforce type checking

This was skipped for unknown reasons.

* Regenerate client from commit 7f25c3e of spec repo

Co-authored-by: Thomas Hervé <[email protected]>
Co-authored-by: api-clients-generation-pipeline[bot] <54105614+api-clients-generation-pipeline[bot]@users.noreply.github.com>
Co-authored-by: ci.datadog-api-spec <[email protected]> b835fc3

Author: api-clients-generation-pipeline[bot]