fix: update recommended inline policy to include iam:UpdateAssumeRolePolicy (#76)

Issue #, if available: aws-controllers-k8s/community#1765

Description of changes:
Updates the recommended inline policy to include `iam:UpdateAssumeRolePolicy`.

This builds from my previous work that was merged in #74, as I did not update the recommended IAM policy at the same time.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: jdockerty

config/iam/recommended-inline-policy

@@ -63,7 +63,8 @@
                 "iam:DeleteOpenIDConnectProvider",
                 "iam:GetOpenIDConnectProvider",
                 "iam:TagOpenIDConnectProvider",
-                "iam:CreateOpenIDConnectProvider"
+                "iam:CreateOpenIDConnectProvider",
+                "iam:UpdateAssumeRolePolicy"
             ],
             "Resource": "*"
         }