Update docker.io/ghost Docker tag to v5.97.0

v5.97.0: 5.97.0

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• ✨ Added unsubscribe_url to member api response (#​21207) - Steve Larson
• 🐛 Fixed NQL filters for single letter slugs (#​21340) - Steve Larson
• 🐛 Fixed missing incoming recommendations (#​21317) - Sag
• 🐛 Fixed missing 'duplicate a post' feature for editors (#​21304) - Sag
• 🌐 New translations and bug fix on /month and /year (#​21267) - Cathy Sarisky

View the changelog for full details: https://github.com/tryghost/ghost/compare/v5.96.2...v5.97.0