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

Update primesieve to 8.0 and primecount to 7.4.
https://github.com/void-linux/void-packages/pull/39837

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

Note: `primesieve` had a soname bump, but it's only used directly by `primecount`. The latter did not bump soname.

Moreover the only use of these libraries in our repo is in `sagemath`, and only through `python3-primecountpy` which does NOT need revbump. Everything can be tested directly in the cli:
```
$ sage -c 'print(prime_pi(10^15))'
29844570422669
$ python -c 'from primecountpy import prime_pi ; print(prime_pi(10**15))'
29844570422669
$ primecount $[10**15]
29844570422669
$ xbps-query --regex -s 'prime(count|sieve)|sagemath-'
[*] primecount-7.4_1             Fast prime counting function
[*] primecount-devel-7.4_1       Fast prime counting function - development files
[*] primesieve-8.0_1             Fast prime number generator
[*] primesieve-devel-8.0_1       Fast prime number generator - development files
[*] python3-primecountpy-0.1.0_1 Python interface to the C++ library primecount
[*] sagemath-9.5_2               Open source mathematics software
```



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