mail/py-postfix-mta-sts-resolver: Update to 1.5.1

• switch to use 'USE_PYTHON=pep517'
• fix build error on Python 3.12[*] and confirmed on 3.13 and 3.14

PR: 292851 [*]
Reported by: portscout, Mike Andrews <mandrews@bit0.com> [*]
ChangeLogs: https://github.com/Snawoot/postfix-mta-sts-resolver/compare/v1.4.0...v1.5.1
Approved by: hrs (mentor, blanket)