fix: make ActClaim conform to Sendable instead of @unchecked Sendable

[NandanPrabhu]

📋 Changes

ActClaim was declared @unchecked Sendable because its additionalClaims property was typed [String: Any], and Any isn't Sendable. This PR removes the escape hatch by typing additionalClaims (and the init?(json:) parameter) as [String: any Sendable], so ActClaim gets real, compiler-checked Sendable conformance instead of an unchecked one.

• Auth0/ActClaim.swift: ActClaim now conforms to Sendable (not @unchecked Sendable); additionalClaims and init?(json:) now use [String: any Sendable].
• Auth0/UserProfile.swift: updated the act claim cast at the ActClaim(json:) call site to [String: any Sendable] to match the new initializer signature.

UserProfile.customClaims remains [String: Any]? (and UserProfile remains @unchecked Sendable) — out of scope for this fix.

📎 References

N/A

🎯 Testing

• swift build succeeds with no errors.
• swift test — full suite passes, no failures.
• swiftlint lint — no new violations introduced by this change.

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