buil: update flatpak runtime to 24.08

Author: Totto16

.github/workflows/flatpak.yml

@@ -13,7 +13,7 @@ jobs:
     name: "Flatpak build"
     runs-on: ubuntu-24.04
     container:
-      image: bilelmoussaoui/flatpak-github-actions:freedesktop-23.08
+      image: bilelmoussaoui/flatpak-github-actions:freedesktop-24.08
       options: --privileged
     steps:
       - uses: actions/checkout@v4

com.github.mgerhold.OOPetris.yml

@@ -1,6 +1,6 @@
 app-id: com.github.mgerhold.OOPetris
 runtime: org.freedesktop.Platform
-runtime-version: "23.08"
+runtime-version: "24.08"
 sdk: org.freedesktop.Sdk
 command: oopetris
 modules: