chore: remove cfnspec patch for Cognito::UserPool.UsernameConfiguration

[madeline-k]

This patch is no longer necessary now that the breaking change changing UsernameConfiguration.CaseSensitive from optional to required has been reverted.

This PR is targeted at v1-main, and is the same as #21029

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[gitpod-io]

[aws-cdk-automation]

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• Commit ID: 74fd708
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