Fix F541 and E711 (#10071)

There are a quite a lot of imports that are unused.

F541 is Unnecessary f-interpolation without placeholders
E711 is incorrect use of == for boolean and None comparisons

## Pull Request Checklist

- [x] The Certbot team has recently expressed interest in reviewing a PR
for this. If not, this PR may be closed due our limited resources and
need to prioritize how we spend them.
- [ ] If the change being made is to a [distributed
component](https://certbot.eff.org/docs/contributing.html#code-components-and-layout),
edit the `main` section of `certbot/CHANGELOG.md` to include a
description of the change being made.
- [ ] Add or update any documentation as needed to support the changes
in this PR.
- [x] Include your name in `AUTHORS.md` if you like.

---------

Co-authored-by: Mads Jensen <atombrella@users.noreply.github.com>

certbot-dns-rfc2136/certbot_dns_rfc2136/_internal/tests/dns_rfc2136_test.py

@@ -51,7 +51,7 @@ class AuthenticatorTest(test_util.TempDirTestCase, dns_test_common.BaseAuthentic
         self.auth.credentials.conf = lambda key: creds.get(key, None)
         client = self.orig_get_client()
         assert client.algorithm == self.auth.ALGORITHMS["HMAC-MD5"]
-        assert client.sign_query == False
+        assert client.sign_query is False
 
     @test_util.patch_display_util()
     def test_perform(self, unused_mock_get_utility):