fix: Obsolete experimental attribute

[fundthmcalculus]

PR-Codex overview

Detailed summary

• Added ListByVerificationTemplateRequest and ListByVerificationTemplateResponse classes to the Trinsic.Services.UniversalWallet.V1 namespace.
• Added ListByVerificationTemplate method to the UniversalWallet class in the Trinsic.Services.UniversalWallet.V1 namespace.
• Added various methods to the UniversalWalletClient class in the Trinsic.Services.UniversalWallet.V1 namespace.
• Added CreateVerificationTemplateRequest, CreateVerificationTemplateResponse, UpdateVerificationTemplateRequest, and UpdateVerificationTemplateResponse classes to the Trinsic.Services.VerifiableCredentials.Templates.V1 namespace.

The following files were skipped due to too many changes: dotnet/Trinsic/Trinsic.xml

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