When did schools stop reciting The Pledge of Allegiance?

Not a very informed question. The simple answer is no schools have ever stopped doing it.

The requirement to offer the opportunity to students to say the Pledge is state law, not federal. (Private schools can do what they want,)

No state with the requirement has ever reversed it. Many states without the requirement obviously never started, so they can't stop it.

Regardless, no student is ever required to say the Pledge of Allegiance. It is entirely optional. And that IS federal law.