IONOS(config): update submodule to d254880545f (added IONOS_MAILCONFI…

[tanyaka]

…G_API configuration)

• Resolves: #

Summary

TODO

• set environment variables as in https://github.com/IONOS-Productivity/nc-docs-and-tools/pull/76
• review feat(config): add IONOS_MAILCONFIG_API configuration ncw-config#26

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[printminion-co]

already merged