Remove QEMU dummy package installation from Linux-pack.yml (#3851)

The QEMU package is now a dummy package. Installing qemu-user-static should be sufficient.

See https://packages.debian.org/buster/qemu for official mention of it being a dummy package.

.github/workflows/Linux-pack.yml

@@ -142,7 +142,7 @@ jobs:
           esac
           if [ -n "${QEMU_ARCH}" ]; then
             sudo apt-get -y -qq update
-            sudo apt-get -y install qemu binfmt-support qemu-user-static
+            sudo apt-get -y install binfmt-support qemu-user-static
             docker run --rm --privileged multiarch/qemu-user-static --reset --persistent yes --credential yes
             cat /proc/sys/fs/binfmt_misc/qemu-${QEMU_ARCH}
           fi