Update Helm release redis to v20.12.2

Author: renovate[bot]

charts/selenium-grid/Chart.yaml

@@ -27,7 +27,7 @@ dependencies:
   name: postgresql
   condition: postgresql.enabled
 - repository: https://charts.bitnami.com/bitnami
-  version: 20.12.1
+  version: 20.12.2
   name: redis
   condition: redis.enabled
 maintainers: