Log Message:
security/stunnel: Update to 5.73

Changelog
### Version 5.73, 2024.09.09, urgency: MEDIUM
* Security bugfixes
  - OpenSSL DLLs updated to version 3.3.2.
  - OpenSSL FIPS Provider updated to version 3.0.9.
* Bugfixes
  - Fixed a memory leak while reloading stunnel.conf
    sections with "client=yes" and "delay=no".
  - Fixed TIMEOUTocsp with values greater than 4.
  - Fix the IPv6 test on a non-IPv6 machine.
* Features
  - HELO replaced with EHLO in the post-STARTTLS SMTP
    protocol negotiation (thx to Peter Pentchev).
  - OCSP stapling fetches moved away from server threads.
  - Improved client-side session resumption.
  - Added support for the mimalloc allocator.
  - Check for protocolHost moved to configuration file
    processing for the client-side CONNECT protocol.
  - Clarified some confusing OpenSSL's certificate
    verification error messages.
  - stunnel.nsi updated for Debian 13 and Fedora.
  - Improved NetBSD compatibility.

### Version 5.72, 2024.02.04, urgency: MEDIUM
* Security bugfixes
  - OpenSSL DLLs updated to version 3.2.1.
* Bugfixes
  - Fixed SSL_CTX_new() errors handling.
  - Fixed OPENSSL_NO_PSK builds.
  - Android build updated for NDK r23c.
  - stunnel.nsi updated for Debian 12.
  - Fixed tests with OpenSSL older than 1.0.2.