chore: add cron (npm) to config.json

[sheerlox]

ℹ️ Repository information

The repository has:

• At least three issues with the good first issue, or other labels specified in config.json (see labels and the end).
• Link: https://github.com/kelektiv/node-cron/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22
• At least 10 contributors.
• At least 1000 stars.
• Detailed setup instructions for the project.
• Link: https://github.com/kelektiv/node-cron/blob/main/CONTRIBUTING.md#working-with-the-code
• CONTRIBUTING.md
• Actively maintained (last updated less than 1 months ago).

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