Auto merge of #25876 - CYBAI:mime-essence, r=Manishearth

Upgrade mime crate to use the essence function

While implementing module script, the `essence` function is not supported in mime crate yet so Manish filed the issue.

So, as that issue is fixed and shipped, we can upgrade mime crate to use the `essence_str` function.

I've tried to run https://threejs.org/examples/webgl_animation_cloth.html locally. Other than a bunch of `Unimplemented canvas2d.fillText`, I can see the animated cloth.

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