Update docker.io/ghost Docker tag to v5.100.1

On both domains I upgraded Ghost successfully by means of Watchtower Docker container update with dependency update facilitated by Mend's Renovate Bot.

This MR contains the following updates:

Release Notes

v5.100.1: 5.100.1

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• 🐛 Fixed newsletter not sending if locale is invalid (#​21573) - Hannah Wolfe

View the changelog for full details: https://github.com/tryghost/ghost/compare/v5.100.0...v5.100.1

v5.100.0: 5.100.0

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• ✨ Added i18n for portal, newsletters, search, comments, etc (#​21547) - Hannah Wolfe
• 🎨 Updated Portal to accept data-locale (#​21420) - Cathy Sarisky
• 🐛 Fixed translations not being picked up in newsletters without reboot (#​21549) - Cathy Sarisky
• 🐛 Fixed error message for when 2fa email sending fails (#​21541) - Princi Vershwal
• 🐛 Fixed migrations for SQLite database users (#​19839) (#​21063) - Mark Stosberg
• 🐛 Fixed "Unsaved post" modal shown when updating visibility in post settings (#​21511) - Princi Vershwal
• 🐛 Fixed post not being saved when updating tags (#​21503) - Princi Vershwal
• 🌐 Updated swedish translations (#​21562) - Daniel Sjöberg
• 🌐 Updated Romanian translations (#​21550) - Andrei Hodorog
• 🌐 Updated Turkish translations (#​21553) - echobilisim3421
• 🌐 Added Polish translations for search (#​21548) - mafizaki
• 🌐 Added more Italian translations (#​21535) - MonRyse
• 🌐 Updated Romanian (RO) translation strings (#​21542) - Andrei Hodorog
• 🌐 Updated Bulgarian translations (#​21533) - Yovko Lambrev
• 🌐 Added more zh-Hant translations (#​21502) - Gary Lai

View the changelog for full details: https://github.com/tryghost/ghost/compare/v5.99.0...v5.100.0