fix: update return type for check is primitive (#15770)

packages/jest-get-type/src/index.ts

@@ -58,4 +58,7 @@ export function getType(value: unknown): ValueType {
   throw new Error(`value of unknown type: ${value}`);
 }
 
-export const isPrimitive = (value: unknown): boolean => Object(value) !== value;
+export const isPrimitive = (
+  value: unknown,
+): value is null | undefined | string | number | boolean | symbol | bigint =>
+  Object(value) !== value;