Make updating the release the default action

[JFronny]

To make the artifacts built by the GTK CI actually available to users, they need to be downloadable from somewhere.
I had intended GitHub Releases to be that place, but it seems like you didn't enable publishing to it the last time you ran the action (the option to do so was intended for testing, since Actions artifacts get deleted after some time and need login to access, but potentially broken builds shouldn't be released).
With this change, the corresponding checkbox is checked by default, which better represents the intended use.

[jwharm]

Thanks!

[JFronny]

Looking at the build log, it seems like my libadwaita patch did not apply in Actions.
The same patch worked without issue on the same versions when I ran it on Actions before submitting it, so I find this very surprising.
I'll try to figure out what is wrong here as soon as I am able (probably in three days)