fix runtime web adapter fetch error

[wuzhiming]

Re: #
When fetching the runtime-web-adapter, there is an issue with the way the runCommand is written, which may cause timing errors and needs to be fixed.

Changelog

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

✅ Package size is not changed

Interface Check Report

This pull request does not change any public interfaces !

[minggo]

there is an issue with the way the runCommand is written

What's the issue?

[wuzhiming]

there is an issue with the way the runCommand is written

What's the issue?
This happened during our Jenkins packaging process. It is likely caused by the upgrade of the Node.js version, which led to changes in the Node.js API. We need to listen to exec.on('close') instead of exec.stdout.on('close').