fix: pass redis SSL config to connection pool

[tarvip]

What this PR does

This fix will pass SSL config properly to redis connection pool.
django-redis passes CONNECTION_POOL_KWARGS and not CONNECTION_POOL_CLASS_KWARGS to connection pool class, related django-redis code can be seen here.

Also, without this fix other settings max_connections and timeout are also not passed to connection pool.

I had issues with external Redis with in-transit encryption enabled using self-signed certs (Google managed Redis).
After changing this I can properly pass self-signed CA cert to redis client using REDIS_SSL_CA_CERTS env variable.

Which issue(s) this PR closes

There is no issue created for this problem.

Checklist

• Unit, integration, and e2e (if applicable) tests updated
• Documentation added (or pr:no public docs PR label added if not required)
• Added the relevant release notes label (see labels prefixed w/ release:). These labels dictate how your PR will
  show up in the autogenerated release notes.

[CLAassistant]

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