GHA: clean up libressl builds with newer libressl

GHA: clean up libressl builds with newer libressl

- Update to latest stable release
- Work-around patches not required anymore
- Official URL of repo has changed

Change-Id: I9b8e69f2b9838cea4cb9001f4e8960b8a39724ef
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Message-Id: <20231201123649.18127-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg27635.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 664dde85be91a5432efe52c90089fcf2bf5d6a3c)