mactracker: checksum update
mactracker: checksum update

Update mactracker from 7.12 to 7.12

Closes #136142.

Signed-off-by: Patrick Linnane <cbb7353e6d953ef360baf960c122346276c6e320@linnane.io>
Signed-off-by: BrewTestBot <8a898ee6867e4f2028e63d2a6319b2224641c06c@users.noreply.github.com>

andrewdisley/homebrew-cask,chrisfinazzo/homebrew-cask,andrewdisley/homebrew-cask,optikfluffel/homebrew-cask,chrisfinazzo/homebrew-cask,optikfluffel/homebrew-cask,andrewdisley/homebrew-cask,chrisfinazzo/homebrew-cask,optikfluffel/homebrew-cask