Devonthink only for macOS 13

[rmschne]

See where already discussed, e.g.

DT4 - DEVONthink 4 - Syncing with DEVONthink 3

We don’t support more than 3-5 major macOS releases usually. Limiting version 4.0 to the last 3 versions ensures that we don’t have to drop macOS releases after this or next year’s WWDC already.