CI: github actions: add OpenSSL-3.0.0 builds

OpenSSL-3.0.0 is getting close to its release, let us add it to build matrix

(cherry picked from commit c3f28a38d261de052143145e87c7292357d40692)
Signed-off-by: William Lallemand <wlallemand@haproxy.org>
1 file changed