Update supercharge/redis-github-action action to v1.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
supercharge/redis-github-action	action	minor	1.7.0 → 1.8.1

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Release Notes

supercharge/redis-github-action (supercharge/redis-github-action)

v1.8.1

Compare Source

Fixed

• change Docker tag from docker:stable to docker:latest

v1.8.0

Compare Source

Added

• add Redis 7 to testing

Updated

• bump GitHub Actions service actions/checkout to version v4

Removed

• remove Redis 4 from testing

Fixed

• fix position of adding the Docker --rm flag to be added before starting the Redis server, because the --rm flag would be passed to the Redis server instead of Docker

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