There's a merged pull request on the void-packages repository

sagemath: update to 10.2, flintlib: update to 3.0.1
https://github.com/void-linux/void-packages/pull/46832

Description:
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#### Testing the changes
- I tested the changes in this PR: **YES**

This is a major update for both sagemath and flintlib.

Sagemath moves to cython 3.

A couple of packages need rebuild or update:

 - eclib: rbuild for flintlib-3.0.1
 - singular: update to 4.3.2p10
 - python3-pplpy: rebuild using cython 3
 - python3-networkx: update to 3.2.1.


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