CI: run command as non-root user

Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>

.github/actions/install-dependencies/action.yml

@@ -5,7 +5,7 @@ runs:
   steps:
   - shell: bash
     run: |
-      sudo cat /etc/apt/sources.list.d/ubuntu.sources
+      cat /etc/apt/sources.list.d/ubuntu.sources
       sudo sed -i 's/^Types: deb/Types: deb deb-src/' /etc/apt/sources.list.d/ubuntu.sources
       export DEBIAN_PRIORITY=critical
       export DEBIAN_FRONTEND=noninteractive