Update http.py & requirements.txt

[melroy89]

Remove external parameter (not used anymore) when upgrading to latest fake-useragent.

[polyrabbit]

Thanks for the lib! just out of curiosity, how did you find I reverted the version...

Also another feedback - it seems we can get a explicit error when failed to get one ua string by setting fallback=None

# https://github.com/fake-useragent/fake-useragent/blob/1.2.1/src/fake_useragent/fake.py#L103-L106
if self.fallback is None:
    raise FakeUserAgentError(
        f"Error occurred during getting browser: {attr}"
    )  # noqa

But __init__ function forbids this setting

# https://github.com/fake-useragent/fake-useragent/blob/1.2.1/src/fake_useragent/fake.py#L40
assert isinstance(fallback, str), "fallback must be string"

Is this the intended behavior?

[polyrabbit]

@melroy89 Merged, thanks. I'm not setting the fallback param now.