chore(deps): update redis docker tag to v6.2.18

Author: renovate[bot]

.gitlab-ci.yml

@@ -76,7 +76,7 @@ test:
     - docker
   services:
     - postgres:11.4-alpine
-    - redis:6.0.1-alpine
+    - redis:6.2.18-alpine
   cache: *cache_dependencies
   variables:
     BOT_CREDENTIALS: cts.example.com@secret@123e4567-e89b-12d3-a456-426655440000