geoip: fix lints

subiquity/server/geoip.py

@@ -75,9 +75,10 @@ class HTTPGeoIPStrategy(GeoIPStrategy):
     """ HTTP implementation to retrieve GeoIP information. We use the
     geoip.ubuntu.com service. """
     async def get_response(self) -> str:
+        url = "https://geoip.ubuntu.com/lookup"
         try:
             async with aiohttp.ClientSession() as session:
-                async with session.get("https://geoip.ubuntu.com/lookup") as response:
+                async with session.get(url) as response:
                     response.raise_for_status()
                     return await response.text()
         except aiohttp.ClientError as e:

subiquity/server/tests/test_geoip.py

@@ -13,8 +13,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import mock
-
 from aioresponses import aioresponses
 
 from subiquitycore.tests import SubiTestCase