[Web] Fix closure compiler builds using BIGINT #83720
Merged
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When using proxy_to_pthread we add BIGINT support (to support exchanging 64 bits integers between wasm and JS).
Bigint though, is part of ECMAScript 2020, and the closure compiler was using ECMAScript 6 instead.
This commit update the CC configuration to use ECMAScript 2020 instead.
Follow up on #79711
Bugsquad edit: