package/stunnel: bump to version 5.60

package/stunnel: bump to version 5.60

This release includes the following changes:

- New features
  - New 'sessionResume' service-level option to allow or disallow session resumption
  - Added support for the new SSL_set_options() values.
  - Download fresh ca-certs.pem for each new release.
- Bugfixes
  - Fixed 'redirect' with 'protocol'. This combination is not supported by 'smtp', 'pop3' and 'imap' protocols.
  - Enforced minimum WIN32 log window size.
  - Fixed support for password-protected private keys with OpenSSL 3.0 (thx to Dmitry Belyavskiy).
  - Added missing TLS options supported in OpenSSL 1.1.1k.

Signed-off-by: Pierre-Jean Texier <texier.pj2@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>