chore(deps): update axllent/mailpit docker tag to v1.20.5

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change	OpenSSF
axllent/mailpit (source)	patch	v1.20.4 -> v1.20.5

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Release Notes

axllent/mailpit (axllent/mailpit)

### [`v1.20.5`](https://redirect.github.com/axllent/mailpit/blob/HEAD/CHANGELOG.md#v1205) [Compare Source](https://redirect.github.com/axllent/mailpit/compare/v1.20.4...v1.20.5) ##### Chore - Update node modules - Use consistent margins for Mailpit label if set - Improve tag detection in UI - Improve link detection in the HTML preview ##### Fix - Use correct parameter order in SpamAssassin socket detection ([#​364](https://redirect.github.com/axllent/mailpit/issues/364))

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