Flatpak: Update runtime to 25.08

[thp]

See also: flathub/net.sourceforge.wavbreaker#2

[thp]

This needs to wait for lipnitsk/libcue#73 to be merged, due to:

========================================================================
Building module libcue in /build/.flatpak-builder/build/libcue-1
========================================================================
FB: Running: git config --bool core.bare false
FB: Running: git checkout master
Already on 'master'
FB: Running: git rev-parse --verify --quiet master:.gitmodules
FB: Running: flatpak build --die-with-parent --env=FLATPAK_BUILDER_BUILDDIR=/run/build/libcue --nofilesystem=host:reset --filesystem=/build/.flatpak-builder/build/libcue-1 --bind-mount=/run/build/libcue=/build/.flatpak-builder/build/libcue-1 --build-dir=/run/build/libcue --bind-mount=/run/ccache=/build/.flatpak-builder/ccache --env=SOURCE_DATE_EPOCH=1767603193 '--env=CFLAGS=-O2 -pipe -g -Wp,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer ' '--env=CXXFLAGS=-O2 -pipe -g -Wp,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer ' '--env=LDFLAGS=-L/app/lib -Wl,-z,relro,-z,now -Wl,--as-needed ' --env=CCACHE_DIR=/run/ccache/disabled --env=PATH=/app/bin:/usr/bin --env=LD_LIBRARY_PATH=/app/lib --env=PKG_CONFIG_PATH=/app/lib/pkgconfig:/app/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig --env=FLATPAK_BUILDER_N_JOBS=4 /build/flatpak_build cmake '-DCMAKE_INSTALL_PREFIX:PATH='\''/app'\''' '-DCMAKE_INSTALL_LIBDIR:PATH='\''lib'\''' -G 'Unix Makefiles' .
CMake Error at CMakeLists.txt:6 (CMAKE_MINIMUM_REQUIRED):
-- Configuring incomplete, errors occurred!
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


Error: module libcue: Child process exited with code 1