Update update_plugin.sh

scripts/update_plugin.sh

@@ -5,11 +5,11 @@ echo "update plugin.yaml"
 sed  -e "s/PLACEHOLDERVERSION/${GITHUB_REF##*/}/g" .github/plugin_template.yaml > plugin.yaml
 
 git fetch --all
-git checkout main
+git checkout master
 git pull
 git config --global user.name "GitHub Actions Build"
 git config --global user.email github-action@aquasec.com
 git add plugin.yaml
 git commit -m "GitHub Actions Build: Update plugin version" || true
-git push --set-upstream origin HEAD:main || true
+git push --set-upstream origin HEAD:master || true