ci: fix wasm-bindgen warning on nightly

[bcheidemann]

Fixes #78

Explanation

When CI runs on nightly rust, with wasm-bindgen >= 0.2.93, the wasm_bindgen_unstable_test_coverage is reported as an unknown condition. This appears to be a bug in wasm-bindgen, but it should not affect action-validator. For now, we can statically declare the wasm_bindgen_unstable_test_coverage cfg as expected by adding the following to our Cargo.toml:

[lints.rust]
unexpected_cfgs = { level = "warn", check-cfg = ['cfg(wasm_bindgen_unstable_test_coverage)'] }

[mpalmer]

QC's having a sook, but it's only a prettier failure, and I'm not going to get upset about that. Thanks for the fix!

[bcheidemann]

QC's having a sook, but it's only a prettier failure, and I'm not going to get upset about that. Thanks for the fix!

I just realised that this branch was behind main. Prettier errors seem to disappear on my local after pulling latest commits.