CI: remove microsoft-prod.list repository (#14628)

This is added by default, and it is often broken, but we don't need anything from it.

Signed-off-by: Philip H <47042125+pheiduck@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b7439ed..98f8d8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -96,6 +96,8 @@
 
       - name: Install packages
         run: |
+          # This is added by default, and it is often broken, but we don't need anything from it
+          sudo rm -f /etc/apt/sources.list.d/microsoft-prod.list
           PKGS=( \
             gettext \
             libgtk2.0-dev:${{ matrix.architecture }} \