Fix: ActionText values for jbuilder-schema

[newstler]

Fixes #680
Fixes bullet-train-co/jbuilder-schema#74

It also updates jbuilder-schema version to 2.6.6, where ActionText issue has been fixed.

[newstler]

@jagthedrummer Seems we fixed the issue with Template requirement, if we get this PR merged we can check bullet-train-co/jbuilder-schema#73 and if everything's ok merge it too! The changes you requested I don't know how to mark I applied them, sorry 😅
Also not sure why bundle setup is failing, as I added Gemfile.lock to the PR and rebased on top of main...

[jagthedrummer]

@newstler, I think the failures are due to us not having all of our dependencies between the core gems defined as explicitly as we should. I'm going to be out for the next couple of days, but next week I'll work on getting those dependency issues resolved so that we can get this merged.

[jagthedrummer]

Getting our entire dependency graph sorted out is going to be a bigish job. For now I just updated the Gemfile.lock in each of the core gems that needs it so we can merge this and get moving again. I'll try to tackle the dependency thing this week.