Insufficient contrast on hover state for links in tables in dark mode

[jacobtylerwalls]

See at https://www.djangoproject.com/download/ the footnote links under "Future Roadmap":

Screenshots with hover state forced on "1":
Dark mode (1.15:1 contrast, this is pretty unreadable):

I'm most concerned with dark mode. Light mode is better (2.79:1 contrast):

---

#2233 adds more links in these tables e.g. ("6.0" links to a roadmap)