Auto merge of #156728 - JonathanBrouwer:rollup-Qv3EfnO, r=JonathanBrouwer

Rollup of 3 pull requests

Successful merges:

 - rust-lang/rust#156146 (test new solver on CI until stabilization)
 - rust-lang/rust#155840 (prefer `T::IS_ZST` over manual check)
 - rust-lang/rust#156723 (Update books)