6.0.0

• Added support for Python 3.12 (#630).
• Removed support for Python 3.7 (#616).
• Switched to Python Cryptography's implementation of certificate validation, in order to simplify the validation logic and make it more reliable (#638).
  • Removed direct dependency to pyOpenSSL.
  • Removed usages of ssl.match_hostname() (#627).
  • JSON output changes for the certificate information plugin:
    • leaf_certificate_subject_matches_hostname has been removed because hostname validation is now directly reported in the path_validation_results, which makes it simpler to process them.
    • Similarly, openssl_error_string was renamed to validation_error.
• Fixed crash caused by "invalid padding" and "invalid encoding" errors (#632, #634).
• Better output when an SMTP EHLO is rejected ( #635).