[no ci] actions: roots check should use cacert.pem filename

.github/workflows/get-roots.yml

@@ -27,7 +27,7 @@ jobs:
         run: |
           git config --local user.email "action@github.com"
           git config --local user.name "GitHub Action"
-          git add roots.pem
+          git add cacerts.pem
           git diff --quiet && git diff --staged --quiet || git commit -am '[ci skip] Updated cacerts.pem'
 
       - name: Push changes