updated to 4.11 ditto sdk and fixed breaking change

[ErikEverson]

• Updated to 4.11 Ditto SDK
• Fixed breaking change with optional value on execute

[Copilot]

Pull Request Overview

This PR upgrades the Ditto SDK to version 4.11 and fixes a breaking change by defaulting the optional arguments parameter to an empty dictionary when calling execute.

• Updated Ditto SDK to 4.11.
• Default arguments to [:] to accommodate the SDK’s changed execute signature.

Comments suppressed due to low confidence (1)

Sources/DittoChatCore/Utilities/Publishers.swift:27

• Add a unit test to verify the behavior when arguments is nil, ensuring the default empty dictionary path behaves as expected.

                    let result = try await self.execute(query: query, arguments: arguments ?? [:])