fix type of GetPropertyDnsPriority

[IvanOrfanidi]

No description provided.

[IvanOrfanidi]

Fix type relative priority of DNS servers.
Replacement uint32 to int32. For dbus api nm.
Bug: Always returned 0 for relative priority.

[Copilot]

Pull Request Overview

This PR fixes the return type of the GetPropertyDnsPriority method from uint32 to int32 across both IPv4 and IPv6 configuration interfaces.

• Changed return type from uint32 to int32 for DNS priority property getter
• Updated both interface definitions and implementations to use signed integers
• Modified underlying property access methods to use getInt32Property instead of getUint32Property

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
IP6Config.go	Updated IPv6 config interface and implementation to return int32 for DNS priority
IP4Config.go	Updated IPv4 config interface and implementation to return int32 for DNS priority

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