Use 'meson setup'

Bare command has been deprecated as of 0.64.0

.gitlab-ci.yml

@@ -17,8 +17,8 @@ flatpak:
   - flatpak install -y flathub org.gnome.Platform 45
   - flatpak install -y flathub org.gnome.Sdk 45
   - flatpak-builder --stop-at=${FLATPAK_MODULE} app ${MANIFEST_PATH}
-  - flatpak build app meson --prefix=/app ${MESON_ARGS} _build
-  - flatpak build app ninja -C _build install
+  - flatpak build app meson setup --prefix=/app ${MESON_ARGS} _build
+  - flatpak build app meson install -C _build
   - flatpak-builder --finish-only --repo=repo app ${MANIFEST_PATH}
   - flatpak build-bundle repo ${BUNDLE} --runtime-repo=${RUNTIME_REPO} ${APP_ID}
   artifacts: