Security: Upgrade @rails/webpacker and jest (#540)
* Security: Upgrade @rails/webpacker and jest * Upgrade jest from 24.9.0 to 25.1.0 * Upgrade @rails/webpacker from 4.0.7 to 4.2.2 * Update test to use 1 worker
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* Security: Upgrade @rails/webpacker and jest * Upgrade jest from 24.9.0 to 25.1.0 * Upgrade @rails/webpacker from 4.0.7 to 4.2.2 * Update test to use 1 worker