Key Code of NINE is wrong

[VangelisAlSghir]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

If I call NINE from @angular/cdk/keycodes, I expect 57

What is the current behavior?

If I call NINE from @angular/cdk/keycodes, I get 91

What are the steps to reproduce?

Just compare the table of key codes here: https://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes

with the key codes here: https://github.com/angular/cdk-builds/blob/master/keycodes/typings/keycodes.d.ts

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Is there anything else we should know?

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