Automated update to sfdc API version 66.0 (#3954)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

cumulusci/cumulusci.yml

@@ -1496,7 +1496,7 @@ project:
         namespace:
         install_class:
         uninstall_class:
-        api_version: "65.0"
+        api_version: "66.0"
     git:
         default_branch: master
         prefix_feature: feature/