[test.pyright] suppress warnings about intentional monkey patching

The warnings:

- "logger" is not defined'
- "supported_languages" is not defined'
- "language_aliases" is not defined'

are very verbose and superfluous, since these messages are related to
intentional monkey patching.

[1] https://github.com/searxng/searxng/pull/783#issuecomment-1019818178



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>