CI: Get ride of a package that doesn't exists on debian...

.gitlab-ci.yml

@@ -18,7 +18,7 @@
         - echo "deb http://deb.debian.org/debian bullseye-backports main" >> /etc/apt/sources.list
         - apt update && apt -y install make libmpv-dev cmake clang clang-format gcc g++ xxd mkvtoolnix
             libcurl4-openssl-dev libsqlite3-dev manpages man-db libfontconfig-dev
-            qt6-base-dev qt6-declarative-dev qt6-multimedia-dev qt6-multimedia-ffmpeg-dev
+            qt6-base-dev qt6-declarative-dev qt6-multimedia-dev
         - curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > rustup.sh
         - chmod +x ./rustup.sh
         - ./rustup.sh -y --default-toolchain beta