tests: fix and update tests: - update code to newer version of `sh` - update code to newer version of `selenium` - update names of OMEMO algorithms - fix paths and names used to mount source to the test container - skip modules using `Gst` and `PyQt` when they are not available.

from typing import Optional

from twisted.words.xish import domish


class BaseError(Exception):
    namespace: str
    condition: str
    text: Optional[str]
    textLang: Optional[str]
    appCondition: Optional[domish.Element]

class StanzaError(BaseError):
    ...