Remove experimental flag from rule W3037 (#3560)

Author: kddejong

src/cfnlint/rules/resources/iam/Permissions.py

@@ -21,7 +21,6 @@ class Permissions(CfnLintKeyword):
     description = "Check for valid IAM Permissions"
     source_url = "https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_action.html"
     tags = ["properties", "iam", "permissions"]
-    experimental = True
 
     def __init__(self):
         """Init"""