feat(helm): update chart mailhog to 5.7.0

[renovate]

This PR contains the following updates:

Package	Update	Change
mailhog (source)	minor	5.6.0 -> 5.7.0

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Release Notes

codecentric/helm-charts (mailhog)

v5.7.0

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An e-mail testing tool for developers

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.03s
✅ REPOSITORY	secretlint	yes		no	27.56s
✅ YAML	prettier	1		0	0.37s
✅ YAML	yamllint	1		0	0.35s

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