`unneeded_throws_rethrows` shows false positives for protocol conformances

[username0x0a]

New Issue Checklist

• I've Updated SwiftLint to the latest version.
• I've searched for existing GitHub issues.

Bug Description

When opting in to a unneeded_throws_rethrows, I'm getting false positives for the following case:

protocol Throwing {
    func doSomething() throws
}

struct SomeType: Throwing {

                        vvvv
    func doSomething() throws {
                        ^^^^
        // Closure without anything thrown
        print("Hello")
    }
}

I believe that this case where the throws declaration is enforced by the protocol conformance shouldn't trigger a positive report for this rule.

Environment

• SwiftLint 0.63.0
• Xcode 26.2 (17C52)
• Installed via Homebrew

...
opt_in_rules:
- unneeded_throws_rethrows
...

[SimplyDanny]

This example works for me without the throws keyword in the struct. Generally, this is allowed. To conform to a throwing function, the implementor doesn't need to be throwing. Reason: The set of non-throwing functions is a subset of the set of throwing functions.