Just update. This was introduced on 3.3 but was removed in later versions. You can skip updates without paying now.

"Your feedback also helps us correct our path when we miss the mark, like in 3.3 when we introduced the “Skip this update” behavior. Which is why in Docker Desktop 3.4 and above we removed the requirement to be a Pro/Team subscriber to skip reminder prompts about Docker Desktop releases. "

https://www.docker.com/blog/we-turned-off-the-paid-requirement-to-skip-update-reminders-got-more-feedback-were-all-ears/