Github Actions: update used actions

Github Actions: update used actions

In the case of the Microsoft action, this fixes security relevant issues
according to their release notes:
https://github.com/microsoft/setup-msbuild/releases

Unfortunately they don't appear to be following the usual scheme of v1
referring to all v1.x.x, but instead v1 just points to v1.0.0.

The primary change with all the Github-Provided actions is the switch to a
more up-to-date NodeJS version (16). Not all that relevant when you just
use the action as is, but on top of that, the old versions are in
low-maintenance mode, and basically are considered obsolete.
Github is actively migrating people to the latest ones via dependabot
wherever they can.
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20220817132302.538-1-timo@rothenpieler.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24954.html

Signed-off-by: Gert Doering <gert@greenie.muc.de>