Workaround wasm build error

[john-h-kastner-aws]

Description of changes

Workaround rustwasm/wasm-bindgen#4207 by applying fix proposed in rustwasm/wasm-bindgen#4210 with a sed script.

This fix is a bit hacky, so we might prefer leaving the WASM build broken until this gets fixed in wasm-bindgen.

Issue #, if available

Checklist for requesting a review

The change in this PR is (choose one, and delete the other options):

• A breaking change requiring a major version bump to cedar-policy (e.g., changes to the signature of an existing API).
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• Updates the "Unreleased" section of the CHANGELOG with a description of my change (required for major/minor version bumps).
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[adpaco-aws]

How do we make sure we go back to this and remove the patch when the wasm-bindgen issue is fixed?

[adpaco-aws]

Do we need to patch just once? If so, maybe we should make sure this is being replaced only once or have a more focused way to apply the patch.

[john-h-kastner-aws]

I've decided I like #1291 better, and it seems to pass CI, so I'll close this