Update CI to test against latest redis server

bmerry · bmerry · commit e7c12f635999 · 2021-10-25T14:27:51.000+02:00
This is needed after cherry-picking jamesls#303.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -40,7 +40,7 @@ jobs:
             coverage: yes
     services:
       redis:
-        image: redis:6.0.10
+        image: redis:6.2.6
         ports:
           - 6379:6379
     steps:
