[MacPorts] #64841: update libressl to 3.4.3

[MacPorts]

#64841: update libressl to 3.4.3
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 Reporter:  artkiver  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:
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 Similar to ticket https://trac.macports.org/ticket/64839 LibreSSL (stable,
 as related to OpenBSD 7.0) was updated to version 3.4.3 on March 15th,
 2022.

 Release notes are available here:
 https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.4.3-relnotes.txt

 Salient security fix related excerpt:

 " * A malicious certificate can cause an infinite loop.
 Reported by and fix from Tavis Ormandy and David Benjamin, Google."

 I already submitted a PR for libressl-devel to bring it to 3.5.1. I won't
 be submitted a diff or PR for 3.3.6 (also released on March 15th, 2022,
 addressing the same security fix) because that is tied more to OpenBSD 6.9
 and the OpenBSD development team only "supporting" two older releases due
 to constraints with developer resources.

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Ticket URL: <https://trac.macports.org/ticket/64841>
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