Typed the error param of Promise.catch as unknown

[syhner]

When using try...catch in strict mode (or with the useUnknownInCatchVariables tsconfig flag enabled) the type of error is unknown

try {} catch (error) {}
//            ^? error: unknown

However when working with promises, the type of a caught error is any

Promise.resolve().catch((error) => {});
//                       ^? error: any

This PR changes the type of error to unknown for consistency (and type safety)

Promise.resolve().catch((error) => {});
//                       ^? error: unknown

[Raynos]

This looks great, can we have it merged /