Drug interactions have been automatically checked by pharmacy software since like the 90s. Pill counting machines have also existed. The trouble with automating a pharmacy technician's job is how dynamic it is. Pharmacy techs do like 20 different things all throughout the day to keep the pharmacy going. Putting pills into bottles is just one part of the equation, and even that's not always cut and dry.

It'll be a good few decades before pharmacy techs start getting replaced I'd wager. Pharmacists are probably in the same boat. In a retail setting anyway. You could definitely run a mail order pharmacy without techs, assuming you had people to maintain the machines and stock the pills.