fix: update bundled flatpak

Signed-off-by: DioEgizio <83089242+DioEgizio@users.noreply.github.com>

.github/workflows/build.yml

@@ -611,7 +611,7 @@ jobs:
   flatpak:
     runs-on: ubuntu-latest
     container:
-      image: bilelmoussaoui/flatpak-github-actions:kde-5.15-23.08
+      image: bilelmoussaoui/flatpak-github-actions:kde-6.7
       options: --privileged
     steps:
       - name: Checkout

flatpak/org.prismlauncher.PrismLauncher.yml

@@ -1,6 +1,6 @@
 id: org.prismlauncher.PrismLauncher
 runtime: org.kde.Platform
-runtime-version: 5.15-23.08
+runtime-version: 6.7
 sdk: org.kde.Sdk
 sdk-extensions:
   - org.freedesktop.Sdk.Extension.openjdk21
@@ -38,7 +38,6 @@ modules:
     config-opts:
       - -DLauncher_BUILD_PLATFORM=flatpak
       - -DCMAKE_BUILD_TYPE=RelWithDebInfo
-      - -DLauncher_QT_VERSION_MAJOR=5
     build-options:
       env:
         JAVA_HOME: /usr/lib/sdk/openjdk17/jvm/openjdk-17