chore: use a newer flatpak runtime (#117)

* use newer flatpak runtime

* .

.github/workflows/rust.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        rustup: [stable, nightly]
+        rustup: [stable]
 
     runs-on: ${{ matrix.os }}
 

crates/coop/resources/flatpak/manifest-template.json

@@ -1,7 +1,7 @@
 {
   "id": "$APP_ID",
   "runtime": "org.freedesktop.Platform",
-  "runtime-version": "23.08",
+  "runtime-version": "24.08",
   "sdk": "org.freedesktop.Sdk",
   "sdk-extensions": ["org.freedesktop.Sdk.Extension.rust-stable"],
   "command": "coop",