Update gotify/server Docker tag to v3.1.1

[renovate]

This PR contains the following updates:

Package	Update	Change
gotify/server	patch	3.1.0 → 3.1.1

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Release Notes

gotify/server (gotify/server)

v3.1.1

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• Require an elevated session for creating users (GHSA-phfm-q6fr-wv34 via #​1048)
• Move theme selection and password change to separate settings page (#​1040 via #​1041 by @​justadityaraj)
• Disable password change form when GOTIFY_LOCALAUTH_ENABLED is disabled (#​1040 via #​1041 by @​justadityaraj)
• Fix crash when a Let's Encrypt request fails (#​1046 by @​NotAFlightRisk)
• Update dependencies

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