Replace javax.inject with jakarta.inject

[cies]

As mentioned in #335 I think it time we make this switch.

jakarta.inject is supported in parallel with Guice 6.x.x (which we use) and exclusively supported with Guice 7.x.x).

I think this is a good move since (a) we already made the move to jakarta packages for persistence, and (b) it is the future.

The discussion on the topic over at Guice can be found here: google/guice#1383