test: use last matching qemu version

The QEMU CI broke recently. The calculation to determine the QEMU
version to install now returns multiple versions. This commit
updates the logic to only take the last result (which I think will
be the newest matching version).

PR-URL: https://github.com/libuv/libuv/pull/2864
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

.github/workflows/CI.yml

@@ -37,7 +37,7 @@ jobs:
           QEMU_SRC: "http://archive.ubuntu.com/ubuntu/pool/universe/q/qemu"
           QEMU_VER: "qemu-user-static_4\\.2-.*_amd64.deb$"
         run: |
-          DEB=`curl -s $QEMU_SRC/ | grep -o -E 'href="([^"#]+)"' | cut -d'"' -f2 | grep $QEMU_VER`
+          DEB=`curl -s $QEMU_SRC/ | grep -o -E 'href="([^"#]+)"' | cut -d'"' -f2 | grep $QEMU_VER | tail -1`
           wget $QEMU_SRC/$DEB
           sudo dpkg -i $DEB
       - name: Install ${{ matrix.config.toolchain }}