chore: drop wasm-bindgen-cli pin to 0.2.100

[thedavidmeister]

The overlay pinned wasm-bindgen-cli to 0.2.100. Any consumer using a newer wasm-bindgen in their Rust deps gets a schema-version mismatch when wasm-bindgen-test-runner marshals their wasm. Drop the pin so consumers track the nixpkgs default (currently 0.2.117) and only need to match it in their own Cargo.lock.

Unblocks rainlanguage/rain.wasm#40 (which needs >=0.2.114 for the new TryFromJsValue API).

Test plan

• nix flake check passes locally.
• After merge, rain.wasm#40's wasm-test job should pass once its Cargo.lock pins wasm-bindgen 0.2.117 too.

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