[minor][Feature]: Support POP and claims in browser core

[antrix1989]

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Proposed changes

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Type of change

• Feature work
• Bug fix
• Documentation
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Additional information

[Copilot]

Pull request overview

This PR updates the IdentityCore submodule to add support for Proof of Possession (POP) and claims functionality in the browser core implementation.

Changes:

• Updated IdentityCore submodule reference to incorporate POP and claims support