Add --experimental-vm-modules flag required by Jest to support ES Module

- jestjs/jest#9430
- isomorphic-git#2035 (comment)

Author: eliot-akira

package-scripts.cjs

@@ -134,8 +134,8 @@ module.exports = {
       setup: series.nps('proxy.start', 'gitserver.start'),
       teardown: series.nps('proxy.stop', 'gitserver.stop'),
       jest: process.env.CI
-        ? retry3(`${timeout5('jest --ci --coverage')}`)
-        : `jest --ci --coverage`,
+        ? retry3(`${timeout5('node --experimental-vm-modules node_modules/jest/bin/jest.js --ci --coverage')}`)
+        : `node --experimental-vm-modules node_modules/jest/bin/jest.js --ci --coverage`,
       karma: process.env.CI
         ? retry3('karma start ./karma.conf.cjs --single-run')
         : 'cross-env karma start ./karma.conf.cjs --single-run -log-level debug',