ci/build: Do not manually install Meson in openSUSE container

Newer image builds already include Meson.

.github/workflows/build.yml

@@ -127,7 +127,6 @@ jobs:
       - name: Install dependencies
         run: |
           ./bootstrap.py
-          zypper -n install meson
           # workaround to avoid "fatal: unsafe repository" error
           git config --global --add safe.directory "$GITHUB_WORKSPACE"