Improve geocoder test flakyness

It looks like the request to [1] produces different results, based on
the client's location. While it worked fine on my workstation, it failed
on GHA.

tests/test_nominatim.py

@@ -103,14 +103,20 @@ def test_stadtteil():
     Test heuristic OSM improvements re. `suburb` vs. `residential` attribute.
     """
 
-    location = resolve_location(latitude=48.482, longitude=9.204)
+    location = resolve_location(latitude=48.482, longitude=9.203)
     improve_location(location)
     assert location.address.suburb == 'Ringelbach'
     assert location.address.city == 'Reutlingen'
     assert location.address.state == 'Baden-Württemberg'
 
     name = format_address(location)
-    assert name == 'Albrechtstraße, Ringelbach, Reutlingen, Baden-Württemberg, DE'
+
+    # Test is flaky in DE vs. US (2022-08-03).
+    # https://github.com/earthobservations/luftdatenpumpe/runs/7650240048
+    assert name in [
+        'Albrechtstraße, Ringelbach, Reutlingen, Baden-Württemberg, DE',
+        'Paul-Pfizer-Straße, Ringelbach, Reutlingen, Baden-Württemberg, DE',
+    ]
 
 
 def test_residential_village():