crypto: use OPENSSL_SIZE_T instead of hard coding int

[aduh95]

This fixes the following warnings when building against boringssl:

[246](https://github.com/nodejs/node/actions/runs/38704739303/job/116321775602?pr=66751#step:8:1247) ../../src/crypto/crypto_common.cc: In function 'ncrypto::StackOfX509 node::crypto::{anonymous}::CloneSSLCerts(ncrypto::X509Pointer&&, const stack_st_X509*)':
../../src/crypto/crypto_common.cc:93:21: error: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Werror=sign-compare]
93 | for (int i = 0; i < sk_X509_num(ssl_certs); i++) {
| ~~^~~~~~~~~~~~~~~~~~~~~~~~
../../src/crypto/crypto_common.cc: In function 'v8::MaybeLocal<v8::Object> node::crypto::{anonymous}::AddIssuerChainToObject(ncrypto::X509Pointer*, v8::Local<v8::Object>, ncrypto::StackOfX509&&, node::Environment*)':
../../src/crypto/crypto_common.cc:110:19: error: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Werror=sign-compare]
110 | for (i = 0; i < sk_X509_num(peer_certs.get()); i++) {
| ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/crypto/crypto_common.cc:133:11: error: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Werror=sign-compare]
133 | if (i == sk_X509_num(peer_certs.get()))
| ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/78403/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.48%. Comparing base (49ad950) to head (e437aa9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66752      +/-   ##
==========================================
- Coverage   90.49%   90.48%   -0.01%     
==========================================
  Files         797      797              
  Lines      277494   277495       +1     
  Branches    53321    53331      +10     
==========================================
- Hits       251115   251097      -18     
+ Misses      16802    16797       -5     
- Partials     9577     9601      +24     

Files with missing lines	Coverage Δ
src/crypto/crypto_common.cc	78.46% <100.00%> (ø)
src/crypto/crypto_context.cc	71.49% <100.00%> (ø)
src/crypto/crypto_hash.cc	69.01% <100.00%> (-0.39%)	⬇️
src/crypto/crypto_x509.cc	73.07% <100.00%> (+0.03%)	⬆️

... and 31 files with indirect coverage changes

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