Support rediss:// URL

[beliayeu]

Is your feature request related to a problem? Please describe.

Ability to specify connection options as a rediss:// URL when using TLS encryption

Describe the solution you'd like

Upgrade ioredis to the version that supports rediss:// URL

Additional context

• the project uses ioredis 3.2.2 while rediss:// feature was introduced in 4.14.0
• besides main package.json, there is @learninglocker/xapi-statements package that requires ioredis 3.x, but the repository of this package is not available
• pr that upgrades ioredis in main project https://github.com/LearningLocker/learninglocker/pull/1595