[openssl/openssl] 861027: Update OPENSSL_buf2hexstr() to use DEFAULT_SEPARATOR.

[Pan Lanlan]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 861027ffd06019baf82148837e30a992ca9b055e
      https://github.com/openssl/openssl/commit/861027ffd06019baf82148837e30a992ca9b055e
  Author: Pan Lanlan <abbypan at gmail.com>
  Date:   2023-09-18 (Mon, 18 Sep 2023)

  Changed paths:
    M crypto/o_str.c

  Log Message:
  -----------
  Update OPENSSL_buf2hexstr() to use DEFAULT_SEPARATOR.

CLA: trivial

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22041)