Fix test suite with Python 3.12

Comparison of floats is always tricky. Use assertAlmostEqual instead of
assertEqual and fix a Gabbi test with a regular expression.

Change-Id: Ifa822f47830fde4cebf59a54c2c2be3ec8f2f02f

Author: James Page

cloudkitty/tests/gabbi/gabbits/v1-report.yaml

@@ -76,7 +76,7 @@ tests:
       service: "cpu"
     status: 200
     response_strings:
-      - "224.616"
+      - "/(224.61)(\\d)*/"
 
   - name: get total for a period filtering on image service
     url: /v1/report/total

cloudkitty/tests/storage/v1/test_storage.py

@@ -156,7 +156,8 @@ def test_get_total_without_filter_but_timestamp(self):
             end=end)['results']
         # FIXME(sheeprine): floating point error (transition to decimal)
         self.assertEqual(1, len(total))
-        self.assertEqual(1.9473999999999998, total[0]["rate"])
+        self.assertAlmostEqual(
+            1.9473999999999998, total[0]["rate"], delta=0.001)
         self.assertEqual(begin, total[0]["begin"])
         self.assertEqual(end, total[0]["end"])