Update to latest gradle version

[solonovamax]

Updates gradle to the latest version, which is 9.2.1

This PR is based on #1

Also adds the distributionSha256Sum property for the gradle distribution

[jwharm]

Similarly to my comment in PR #3, we can't use the Gradle wrapper in an offline flatpak build. The flatpak build is currently setup to run the Gradle distribution that is included in the OpenJDK extension to the Freedesktop SDK used by GNOME 48, and that is Gradle 8.12.1.
The Gradle Wrapper can still be useful for people who want to build and run the app locally, but for consistency, it should be the 8.12.1 wrapper.

[solonovamax]

Similarly to my comment in PR #3, we can't use the Gradle wrapper in an offline flatpak build. The flatpak build is currently setup to run the Gradle distribution that is included in the OpenJDK extension to the Freedesktop SDK used by GNOME 48, and that is Gradle 8.12.1.
The Gradle Wrapper can still be useful for people who want to build and run the app locally, but for consistency, it should be the 8.12.1 wrapper.

ah, I see

in that case, I should downgrade it from 9.0.0 -> 8.12.1 (you had it set to 9.0.0), yeah?

[jwharm]

Yes please.
I didn’t think of this when I added the wrapper.