Fix quotient ring sqrt

[grhkm21]

Fixes #41386.

Not sure if this is the correct approach, but it works @tscrim

[github-actions]

Documentation preview for this PR (built with commit 563877c; changes) is ready! 🎉
This preview will update shortly after each push to this PR.

[tscrim]

Now you have what amounts to a trivial doctest failure in the _contains_helper test in categories/fields.py due to the change in category. You can just replace it with Zmod I think:

            sage: Q = Zmod(37)
            sage: Q.category()
            Join of Category of finite commutative rings
             and Category of subquotients of monoids
             and Category of quotients of semigroups
             and Category of finite enumerated sets
            sage: F = Fields()
            sage: F._contains_helper(Q)
            False
            sage: Q in F  # This changes the category!
            True
            sage: F._contains_helper(Q)
            True