security/s2n-tls: Update to 1.4.15

ChangeLog: https://github.com/aws/s2n-tls/releases/tag/v1.4.15

security/s2n-tls/Makefile

 PORTNAME=	s2n-tls
 DISTVERSIONPREFIX=	v
-DISTVERSION=	1.4.14
+DISTVERSION=	1.4.15
 PORTEPOCH=	1
 CATEGORIES=	security
 

security/s2n-tls/distinfo

-TIMESTAMP = 1715420735
-SHA256 (aws-s2n-tls-v1.4.14_GH0.tar.gz) = 90cd0b7b1e5ebc7e40ba5f810cc24a4d604aa534fac7260dee19a35678e38659
-SIZE (aws-s2n-tls-v1.4.14_GH0.tar.gz) = 4637693
+TIMESTAMP = 1716447898
+SHA256 (aws-s2n-tls-v1.4.15_GH0.tar.gz) = e1a258247714c0887f38c8438e162f54947eab78dc81f841ec7e9c90402a71d0
+SIZE (aws-s2n-tls-v1.4.15_GH0.tar.gz) = 4641878