Rollup merge of #129534 - workingjubilee:ratchet-wasm-c-abi-fcw-to-deny, r=daxpedda,alexcrichton

Deny `wasm_c_abi` lint to nudge the last 25%

This shouldn't affect projects indirectly depending on wasm-bindgen because cargo passes `--cap-lints=allow` when building dependencies.

The motivation is that the ecosystem has mostly taken up the versions of wasm-bindgen that are compatible in general, but ~25% or so of recent downloads remain on lower versions. However, this change might still be unnecessarily disruptive. I mostly propose it as a discussion point.

Author: matthiaskrgr