Fix #52093: openssl_csr_sign truncates $serial

We use `ASN1_INTEGER_set_int64()` if supported[1], to avoid the
truncation of the integer.

[1] <https://www.openssl.org/docs/man1.

Fix #52093: openssl_csr_sign truncates $serial

We use `ASN1_INTEGER_set_int64()` if supported[1], to avoid the
truncation of the integer.

[1] <https://www.openssl.org/docs/man1.1.0/man3/ASN1_INTEGER_set_int64.html#HISTORY>

Closes GH-7209.

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