[Table] Change divider color in dark theme (#13395)
[Table] Change divider color in dark theme (#13395)

* [Table] Change divider color in dark theme

* Use a non alpha color

There is an issue with Chrome that requires us to use a non alpha color:
https://github.com/mui-org/material-ui/issues/9149

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