Add a note about Redis dump file

What does this merge request do and why?

This MR adds a note about Redis dump file that could be incompatible between different Redis versions and should be removed before moving to asdf. Otherwise you'll get this error when trying to launch a Redis service:

2023-04-19_21:04:44.95326 redis                 : 32595:M 20 Apr 2023 01:04:44.953 * Running mode=standalone, port=0.
2023-04-19_21:04:44.95326 redis                 : 32595:M 20 Apr 2023 01:04:44.953 # Server initialized
2023-04-19_21:04:44.95334 redis                 : 32595:M 20 Apr 2023 01:04:44.953 # Can't handle RDB format version 10
2023-04-19_21:04:44.95336 redis                 : 32595:M 20 Apr 2023 01:04:44.953 # Fatal error loading the DB: Invalid argument. Exiting.

How to set up and validate locally

1. Install GDK manually with Redis 10
2. Follow the guide to move to asdf
3. Restart GDK, it should work

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.