Fix simple-auth server example AuthorizationCode.redirect_uri type

[basoko]

The AuthorizationCode.redirect_uri field type is AnyUrl, but the example used AnyHttpUrl type.

This mismatch causes the redirect URI check in TokenHandler to fail, since it compares against AuthorizationCodeRequest.redirect_uri, which also expects AnyUrl.

Motivation and Context

It makes the simple-auth server example to work with simple-auth client example. Without the change when client requests to get the token it fails with a "Bad Request" error.

How Has This Been Tested?

Manually by running server and client examples locally.

Breaking Changes

No.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• [] I have added appropriate error handling
• [] I have added or updated documentation as needed

Additional context

[pcarleton]

this part of the example has been simplified now