Redis itself IS NOT changing licenses, and if you only use the core Redis product you are unaffected. This license change only applies (or _will_ apply, I guess) to some source-available addon Redis modules. (I'm not sure if any existing open-source modules developed by Redis Labs will have their license changed, or if this will only apply to modules published after the announcement.)
Full disclosure: Am a Redis Labs employee, although not here in any official capacity.