Update maxking/mailman-web Docker tag to v0.5

This MR contains the following updates:

Package	Update	Change
maxking/mailman-web	minor	0.4 -> 0.5

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This MR has been generated by Renovate Bot.

mentioned in issue #40

changed the description

added 63 commits

• 592aa254...cb907c40 - 62 commits from branch master
• f57ebb84 - Update maxking/mailman-web Docker tag to v0.5

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