Describe the bug
Cup is showing there is an update for zerobyte from 0.18 to 0.19 even tho I updated it. I had image version tag set to 0.18 but then I update compose to say 0.19 and updated it but Cup still shows as update available.

To Reproduce
Steps to reproduce the behavior:

1. Have service with specific image version
2. Update image tag to newer version of the image
3. Cup still shwos update available

Expected behavior
Cup should show that service has been updated.

Screenshots

System info (please complete the following information):

• OS: Debian12
• Docker daemon version: 26.1.0
• Cup version: 3.5.1