Bump time to 1.12.1
I've just released time-1.12.1 to Hackage. The corresponding git commit is the ghc branch, which always points to the commit that I intend for GHC (and matches the latest release in Hackage).
Please ignore time-1.13, it has been deprecated and rendered unplannable in Hackage.
Not sure if this replaces #19985 (closed).