ci: select only GCC 12 artifacts

Author: gnikit

.github/workflows/CI.yml

@@ -289,6 +289,7 @@ jobs:
       uses: actions/download-artifact@v4
       with:
         path: fpm-cd-artifacts
+        pattern: 'fpm-*-gcc-12*'
         merge-multiple: true
 
     - name: Normalize file names for continuous delivery