Update github oidc token url in cfn template

This commit updates the example "IAM Role CloudFormation Template" with the new github oidc token url.
See issue aws-actions#280 for further explanation: aws-actions#280

Author: mitch-keenan

README.md

@@ -145,13 +145,13 @@ Resources:
               Federated: !Ref GithubOidc
             Condition:
               StringLike:
-                vstoken.actions.githubusercontent.com:sub: !Sub repo:${GitHubOrg}/${RepositoryName}:*
+                token.actions.githubusercontent.com:sub: !Sub repo:${GitHubOrg}/${RepositoryName}:*
 
   GithubOidc:
     Type: AWS::IAM::OIDCProvider
     Condition: CreateOIDCProvider
     Properties:
-      Url: https://vstoken.actions.githubusercontent.com
+      Url: https://token.actions.githubusercontent.com
       ClientIdList: [sigstore]
       ThumbprintList: [a031c46782e6e6c662c2c87c76da9aa62ccabd8e]