accounts/keystore: zeroize decrypted key in Update() after use #33090
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Add defer zeroKey(key.PrivateKey) in KeyStore.Update() to securely wipe the decrypted private key from memory after re-encrypting with the new passphrase. This change improves secret hygiene and aligns Update() with existing practices in SignHashWithPassphrase(), SignTxWithPassphrase(), Import(), and Delete()