ci: use cpactions cpa.sh shell + bump FreeBSD and OpenBSD

[madebr]

• I confirm that I am the author of this code and release it to the SDL project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Description

Using the run: option of cpactions is deprecated, so switch over to using the cpa.sh shell script.
This integrates rather well with the already-existing steps.

This also bumps OpenBSD and FreeBSD ci versions.

There are some build errors with FreeBSD and NetBSD for which I need help.

Existing Issue(s)

[madebr]

• FreeBSD cannot find the xfixes headers during CMake configuration time. However libXfixes is installed
• OpenBSD fails when verifying the usage of SDL3 libraries. Doing -lSDL3 somehow selects the static library where both flavors (shared and static) are available.
• NetBSD also fails while verifying the libraries: inotify_init and inotify_add_watch cannot be found for the shared library.