Add support for Xcode 26

[kailuo]

• Added support for Xcode 26
• Fixed a potential memory leak

[Copilot]

Pull Request Overview

This PR adds support for Xcode 26 and fixes a potential memory leak by migrating from deprecated .bytes property to the Swift standard [UInt8]() initializer for Data-to-byte array conversions across cryptographic operations.

• Replaced deprecated .bytes property with [UInt8](data) for Data-to-byte array conversions
• Fixed memory leak by properly managing secp256k1 context destruction
• Updated cryptographic functions to use modern Swift Data handling

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
Sources/HDWalletKit/Mnemonic/Mnemonic.swift	Updated PBKDF2 function to use modern Data-to-bytes conversion
Sources/HDWalletKit/Core/Crypto/Encryption/EllipticCurveEncrypterSecp256k1.swift	Migrated cryptographic key operations from deprecated .bytes to [UInt8]()
Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift	Fixed memory leak and updated signature verification to use modern Data handling

Comments suppressed due to low confidence (1)

Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift:1

• Variable shadowing issue: the parameter hash is being shadowed by the local variable hash. This makes the precondition check the converted array instead of the original Data parameter. Move the conversion after the precondition check.

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