package/redis: bump to v6.2.1

package/redis: bump to v6.2.1

From the release notes:
Introduction to the Redis 6.2 release
=====================================

This release is the first significant Redis release managed by the core team
under the new project governance model.

Redis 6.2 includes many new commands and improvements, but no big features. It
mainly makes Redis more complete and addresses issues that have been requested
by many users frequently or for a long time.
=====================================

See https://github.com/redis/redis/blob/6.2/00-RELEASENOTES

Signed-off-by: Titouan Christophe <titouanchristophe@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>