chore: topos reference

[atanmarko]

Description

Bump topos version to always use main docker tag (head of topos main branch image)

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works