Update $red- variables in GitLab SCSS to match GitLab UI
Context
In gitlab-ui!1099 (merged) updates happened to each hue to help establish a better accessible and predictable color palette.
The red hue had several hex updates across each step, but the shift is rather minimal and should have low impact.
Solution
Update the hex values of the $red-
variables in GitLab SCSS to match those in GitLab UI SCSS.
Edited by Jeremy Elder