chore: Fix increased flakinnes of curl_cffi based tests

[Pijukatel]

Description

• Limit cffi to version <2.0.0 to avoid increased test flakiness on Windows and Python 3.10

Issues

• Closes: Fix increased flakinnes of curl_cffi based tests on Windows and Python 3.10 #1494

Testing

• Running tests in CI and monitoring for flakiness

[Pijukatel]

Running on Windows with Python3.10 I got a lot of event loop warnings and maybe this one is specifically for curl based tests

tests/unit/http_clients/test_curl_impersonate.py: 4 warnings
D:\Workspace\Python\crawlee-python.venv\lib\site-packages\curl_cffi\aio.py:144: CurlCffiWarning:
Proactor event loop does not implement add_reader family of methods required.
Registering an additional selector thread for add_reader support.
To avoid this warning use:
asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())

Given that, maybe it would be best to use WindowsSelectorEventLoopPolicy all the time in our tests

[Pijukatel]

Randomizing test order is enough to make UTs stable. This means that some tests are not properly isolated. This could cause some race conditions for shared resources. Maybe the session-scoped test server together with xdist is the problem, too hard to debug and most likely not a product issue, but test setup issue.