CI: Remove a couple unneeded system dependencies

libqt6svg6-dev - We don't use Qt's SVG support any longer.

qt6-multimedia-dev - We already install libpulse-dev, so the Qt6
multimedia package is unused.

.github/actions/setup/action.yml

@@ -26,8 +26,8 @@ runs:
 
         sudo apt-get update
         sudo apt-get install autoconf autoconf-archive automake build-essential ccache clang-18 clang++-18 cmake curl fonts-liberation2 \
-            gcc-13 g++-13 libavcodec-dev libegl1-mesa-dev libgl1-mesa-dev libpulse-dev libqt6svg6-dev libssl-dev libstdc++-13-dev lld-18 \
-            nasm ninja-build qt6-base-dev qt6-multimedia-dev qt6-tools-dev-tools tar unzip zip
+            gcc-13 g++-13 libavcodec-dev libegl1-mesa-dev libgl1-mesa-dev libpulse-dev libssl-dev libstdc++-13-dev lld-18 nasm ninja-build \
+            qt6-base-dev qt6-tools-dev-tools tar unzip zip
 
         sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-18 100
         sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-18 100