chore: Update in-tree flatpak to use kde platform 6.10

6.8 is eol. Also 6.10 requires codecs-extra so it fixes compatibility with replaymod.

flathub should also get updated to 6.10 but it's not as important because 6.9 isnt eol

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

flatpak/org.prismlauncher.PrismLauncher.yml

@@ -1,6 +1,6 @@
 id: org.prismlauncher.PrismLauncher
 runtime: org.kde.Platform
-runtime-version: '6.8'
+runtime-version: '6.10'
 sdk: org.kde.Sdk
 sdk-extensions:
   - org.freedesktop.Sdk.Extension.openjdk17