[docs] Adapt CONTRIBUTING.md for https instead of SSH git clone (#21187)
[docs] Adapt CONTRIBUTING.md for https instead of SSH git clone (#21187)


oliviertassinari/material-ui,rscnt/material-ui,mui-org/material-ui,mbrookes/material-ui,callemall/material-ui,callemall/material-ui,mbrookes/material-ui,mui-org/material-ui,mbrookes/material-ui,callemall/material-ui,lgollut/material-ui,rscnt/material-ui,oliviertassinari/material-ui,mui-org/material-ui,oliviertassinari/material-ui,callemall/material-ui,rscnt/material-ui