Update LinuxServer image to 0.55.7-ls297

[BeeJoe]

Summary

• Update the LinuxServer changedetection.io image from 0.55.7-ls296 to 0.55.7-ls297.
• Bump the StartOS package revision from 0.55.7:1 to 0.55.7:2.
• Refresh release notes for the LinuxServer build-only update.

Validation

• docker buildx imagetools inspect lscr.io/linuxserver/changedetection.io:0.55.7-ls297
• npm run check
• npm run build
• git diff --check