Fix package dependency declarations in package manifest

[mattt]

Follow-up to #30

Attempting to resolve dependencies in an app, Xcode is reporting this error:

exhausted attempts to resolve the dependencies graph, with the following dependencies unresolved:

• 'mlx-swift-lm' from https://github.com/ml-explore/mlx-swift-lm/

This PR drops the trailing slash, which I don't recall being a problem before, but is the only reason I can think of for this not working as expected.

This PR also takes this opportunity to drop .git suffixes from dependency declarations and sort them lexicographically by owner.

[Copilot]

Pull Request Overview

This PR fixes a dependency resolution issue in the Swift Package Manager manifest by removing a trailing slash from the mlx-swift-lm package URL that was causing Xcode to fail to resolve dependencies. Additionally, it removes .git suffixes from all package URLs for consistency and sorts the dependencies lexicographically.

• Removed trailing slash from mlx-swift-lm URL to fix dependency resolution
• Removed .git suffixes from package URLs for consistency
• Sorted dependencies alphabetically

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