update readme to v3 to support node 20 gh actions

[lexabu]

Replace the bullet points below with your answers

Description

To update the readme from retry@v2 to retry@v3 to support node 20 and prevent others from getting the 'Node.js 16 actions are deprecated.' warning on github actions

[lexabu]

Feel free to merge once approved.

[TWiStErRob]

This PR has no changes now, I think it's fixed.