Typing errors in Typescript 4.8+

[mrazorvin]

Hi,

In typescript 4.8+ generics no longer assignable to {}, those changes cause following error

to fix this, generics in styletron must extends {}

Index: ./node_modules/styletron-react/lib/types.d.ts
--- ./node_modules/styletron-react/lib/types.d.ts
+++ ./node_modules/styletron-react/lib/types.d.ts
@@ -67,7 +67,7 @@
     displayName?: string;
 }
 export declare type StyledFn = {
-    <T extends React.ElementType, Props>(component: T, style: StyleObject | ((props: Props) => StyleObject)): StyletronComponent<T, Props>;
+    <T extends React.ElementType, Props extends {}>(component: T, style: StyleObject | ((props: Props) => StyleObject)): StyletronComponent<T, Props>;
 };
 export declare type WithStyleFn = {
     <Base extends StyletronComponent<any, any>, Props = {}>(component: Base, style: StyleObject | ((props: Props) => StyleObject)): Base extends StyletronComponent<infer D, infer P> ? StyletronComponent<D, P & Props> : never;