OPT: Bump net-imap from 0.5.4 to 0.5.6 in the bundler group #641

Job	Run time
Build Image / Development	1m 35s
Build Image / Cypress	54s
Build Image / Preview	2m 1s
Build Image / Production	1m 37s
Build Image / Test	1m 43s
Lint / ESLint	40s
Lint / ESLint - Tests	41s
Lint / Reek	20s
Lint / Rubocop	21s
Lint / Brakeman	22s
Lint / Bundler Audit	22s
Lint / SCSSLint	21s
Tests / End-to-end - Admin (chrome)	4m 45s
Tests / End-to-end - Frontend (chrome)	1m 38s
Tests / End-to-end - Admin (firefox)	4m 57s
Tests / End-to-end - Frontend (firefox)	1m 36s
Tests / Backend	46s
Preview / Deploy	2s
	24m 41s

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