add useFilter support for @typescript-eslint/unbound-method (adobe#9454)

resolves adobe#9453

Author: quisido

packages/@react-aria/i18n/src/useFilter.ts

@@ -15,11 +15,11 @@ import {useCollator} from './useCollator';
 
 export interface Filter {
   /** Returns whether a string starts with a given substring. */
-  startsWith(string: string, substring: string): boolean,
+  startsWith: (string: string, substring: string) => boolean,
   /** Returns whether a string ends with a given substring. */
-  endsWith(string: string, substring: string): boolean,
+  endsWith: (string: string, substring: string) => boolean,
   /** Returns whether a string contains a given substring. */
-  contains(string: string, substring: string): boolean
+  contains: (string: string, substring: string) => boolean
 }
 
 /**