chore(deps): update axllent/mailpit docker tag

[renovate]

This PR contains the following updates:

Package	Update	Change
axllent/mailpit (source)	minor	v1.21 -> v1.22
axllent/mailpit (source)	minor	v1.21.8 -> v1.22.0

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Release Notes

axllent/mailpit (axllent/mailpit)

v1.22

Feature

• SMTP auto-forwarding option (#​414)
• Option to override the From email address in SMTP relay configuration (#​414)
• Add Chaos functionality to test integration handling of SMTP error responses (#​402, #​110, #​144 & #​268)

Chore

• Update node dependencies
• Update Go dependencies

Fix

• Update command npm run update-caniemail save path (#​422)
• Correct date formatting in TestMakeHeaders

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