Reporting a gmp bug

[jy l]

Dear developers/maintainers,

Hope this email finds you well!
I'm writing to report a crash we met while using libgmp. The POC looks like
this:
```
mpz_t n;
mpz_init(n);
mpz_fac_ui(n, 0x10006f);

mpz_t n2;
mpz_init(n2);
mpz_nextprime(n2, n);
```
It seems like in `mpz_nextprime` this line (
https://gmplib.org/repo/gmp/file/tip/mpz/nextprime.c#l204), when `n` is
very large, it doesn't restrict the value of `odds_in_composite_sieve`
which leads to the `alloca` below crash and might cause more buffer
overflow.
Could you please help us to verify this bug? Looking forward to your reply,
thanks!

Best regards,
Jiayi Lin