Fix migration milestone date
What does this MR do and why?
!138610 (merged), which was merged just now, contained a finalizing migration for a BBM with the wrong milestone 16.7. The milestone should've been 16.8.
Edited by euko
!138610 (merged), which was merged just now, contained a finalizing migration for a BBM with the wrong milestone 16.7. The milestone should've been 16.8.