fix(docker-compose): update to redis:7

[kennethrioja]

Summary of changes

Upgrading redis in docker-compose.yml to version 7 as the latest gem/ruby/ror made some of the gems only compatible with version 7 of redis

Motivation and context

Tests weren't passing under redis:6

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

Upgrades the Redis container image used by TeSS’s local and production Docker Compose setups to Redis 7 to restore compatibility with newer Ruby/Rails/gem dependencies and get tests passing again.

Changes:

• Update docker-compose.yml Redis image from redis:6 to redis:7.
• Update docker-compose-prod.yml Redis image from redis:6 to redis:7.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docker-compose.yml	Bumps the dev/test Redis service image to Redis 7.
docker-compose-prod.yml	Bumps the production Redis service image to Redis 7.

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