Update number of approvers required from 3 to 2

.mergify.yml

@@ -70,7 +70,7 @@ pull_request_rules:
           - 'author~=^dependabot(|-preview)\[bot\]$'
           - and:
               - 'approved-reviews-by=@nektos/act-maintainers'
-              - '#approved-reviews-by>=3'
+              - '#approved-reviews-by>=2'
       - -draft
       - -merged
       - -closed