Updated jest config file to (hopefully) work in GitHub Actions (it previously worked locally but not in GitHub Actions)

Author: jongpie

jest.config.ts jest.config.ctsjest.config.ts renamed to jest.config.cts

@@ -1,4 +1,6 @@
-export default {
+import type { Config } from 'jest';
+
+const config: Config = {
   preset: 'ts-jest',
   testEnvironment: 'node',
   roots: ['<rootDir>'],
@@ -13,3 +15,5 @@ export default {
     '^(\\.\\.?\\/.+)\\.js$': '$1',
   },
 };
+
+export = config;