Use apt rather than apt-get

Prefer the more modern tool over the deprecated one. This should avoid
any surprises in future when it's finally removed.

Author: afayaz-feral

.github/workflows/build-and-test.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v2
       - name: Install dependencies
         run: |
-          sudo DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential meson appstream clang clang-format clang-tools libdbus-1-dev libinih-dev libsystemd-dev systemd-dev
+          sudo DEBIAN_FRONTEND=noninteractive apt install -y build-essential meson appstream clang clang-format clang-tools libdbus-1-dev libinih-dev libsystemd-dev systemd-dev
       - name: Check format
         env:
           CI: "true"