fix(types): change update signature of IAuthProvider (#12496)

Change the signature of the `update` method in `IAuthProvider` to match other methods. this is necessary as in the generated references `update` was being inferred as a property rather than a method.

.changeset/eighty-moles-occur.md

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+---
+"@medusajs/types": patch
+---
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+fix(types): change update signature of IAuthProvider