Fix caching test

This PR fixes the caching tests in SpotCacheTest. The default caching mechanism in the WiScout project is the dummy cache, which implements the caching interface but doesn't actually cache. This overrides the CACHES setting for this test only to ensure that a real caching implementation (in this case, Local Memory) is used.

Please review: @NUWAN.KUMARASIRI @TREFILEK @bjsousa

spotseeker_server/test/spot_caching.py

-from django.test import TestCase
+from django.test import TestCase, override_settings
 from django.core.cache import cache
 from spotseeker_server.models import Spot
 
 
+@override_settings(CACHES={'default':{'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}})
 class SpotCacheTest(TestCase):
 
     def test_spot_caching(self):