Bump redis version to 3.2.12
Closes: https://gitlab.com/charts/gitlab/issues/784
[Update] Decided to compile 3.2.12 to have parity with redis chart.
Original title: Bump redis version to 3.2.6-3+deb9u2 in redis-ha chart
This revision backports the security fixes that went into upstream 3.2.12 version. Details: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901495
Edited by Balasankar 'Balu' C