chore: update Flatpak runtime version to 25.08 in build-rc workflow

Author: lockedmutex

.github/workflows/build-rc.yml

@@ -321,9 +321,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y flatpak-builder
           sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
-          sudo flatpak install --noninteractive flathub org.freedesktop.Sdk/${{ matrix.flatpak_arch }}/24.08
-          sudo flatpak install --noninteractive flathub org.freedesktop.Platform/${{ matrix.flatpak_arch }}/24.08
-          sudo flatpak install --noninteractive flathub org.freedesktop.Sdk.Extension.openjdk/${{ matrix.flatpak_arch }}/24.08
+          sudo flatpak install --noninteractive flathub org.freedesktop.Sdk/${{ matrix.flatpak_arch }}/25.08
+          sudo flatpak install --noninteractive flathub org.freedesktop.Platform/${{ matrix.flatpak_arch }}/25.08
+          sudo flatpak install --noninteractive flathub org.freedesktop.Sdk.Extension.openjdk/${{ matrix.flatpak_arch }}/25.08
 
       - name: Build Flatpak Bundle
         run: |