redis: increase the max number of fds to actually match redis.conf
redis: increase the max number of fds to actually match redis.conf

Now that the processes no longer runs as root, we need to increase
the limit for it.

This only affects systemd based systems.

Signed-off-by: Frank Meerkoetter <86a8c2da8527a1c6978bdca6d7986fe14ae147fe@meerkoetter.org>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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