fix(ts): infer provider type in signIn (#4679)

* fix: signIn infer provider type

The "P" type it's not passed in any props, so the result type doesn't understand and return the false type always, Adding the "P" at provider type props.

* fix: P possibly undefined

Co-authored-by: arthurpedroti@gmail.com <arthurpedroti@LAPTOP-MVAK9RM5.localdomain>

packages/next-auth/src/react/index.tsx

@@ -175,7 +175,7 @@ export async function getProviders() {
 export async function signIn<
   P extends RedirectableProviderType | undefined = undefined
 >(
-  provider?: LiteralUnion<BuiltInProviderType>,
+  provider?: LiteralUnion<P extends RedirectableProviderType ? P | BuiltInProviderType : BuiltInProviderType>,
   options?: SignInOptions,
   authorizationParams?: SignInAuthorizationParams
 ): Promise<