change branch name from master to main in workflow trigger

Author: Smaran-Teja

.github/workflows/plot.yml

@@ -3,7 +3,7 @@ name: Benchmark CI
 on:
   push:
     branches:
-      - master
+      - main
   workflow_dispatch:
 
 permissions:
@@ -39,4 +39,4 @@ jobs:
           git config --global user.email 'github-actions[bot]@users.noreply.github.com'
           git add .
           git commit -m "Update timing plots [skip ci]" || echo "No changes to commit"
-          git push
+          git push