Migrate all Examples and other sample mode to Swift 6 language mode

### Motivation

Now that Swift 6 language mode has been released as part of the Swift 6.0 toolchain, we should bump the tools version of all our Examples and sample code.

### Proposed solution

Bump swift-tools-version in the Package.swift files of the examples to 6.0 and make sure they all still build without warnings.

### Alternatives considered

_No response_

### Additional information

_No response_

Locate all Package.swift files under the Examples and other sample-code areas, then inspect their current swift-tools-version values. Update the manifests to Swift 6.0 and build each example with the Swift 6.0 toolchain, confirming that they complete without warnings.

Written by the indexing model from the issue text.