GHA: Dependency and Actions update April 2025 (2.6)

GHA: Dependency and Actions update April 2025 (2.6)

- Update all actions to latest releases.
- Update vcpkg commit to latest master.

Change-Id: Ie9bffcc487f53a3a8ae6e59b79e654360d99902c
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Message-Id: <20250331153309.77901-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31290.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 0ffa7b57fdfb2658ae326baea0871ccca2c01b7d)
Message-Id: <20250402154409.12205-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31330.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>