GHA: Maintenance update November 2025

GHA: Maintenance update November 2025

Includes the following renovate changes:
- chore(deps): update dependency mbed-tls/mbedtls to v3.6.5
- chore(deps): update vcpkg digest to 3bbc280
- chore(deps): update dependency libressl/portable to v4.2.1
- chore(deps): update github actions
- chore(deps): update dependency aws/aws-lc to v1.64.0
- chore(deps): update github actions

Additionally, drop macos-13 since the
worker is deprecated.

Change-Id: Ifd63130832e3bf20bf9816887e218ae73e2f5cd1
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Yuriy Darnobyt <yura.uddr@gmail.com>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1381
Message-Id: <20251119135458.31160-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34543.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>