[minor]: raise toolchain requirement to 6.0, format code

[tayloraswift]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on modernizing the swift-jpeg library by raising the minimum toolchain requirement, formatting the code for better readability, and updating the project's build configuration. These changes ensure compatibility with the latest Swift features and improve the overall maintainability of the project.

Highlights

• Toolchain Requirement: The minimum Swift toolchain requirement has been raised to 6.0, ensuring compatibility with the latest language features and improvements.
• Code Formatting: The codebase has been formatted for improved readability and consistency.
• Gitignore Updates: The .gitignore file was updated to exclude vscode build files and the Package.resolved file.
• Package Manifest Changes: The Package.swift file was modified to include a dependency on dollup and enable upcoming and experimental features.
• Test Script Improvements: The TestAll script was updated to include stricter error handling and dollup execution.
• Code Modernization: Snippets were updated to use more modern Swift syntax.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/Tests.yml

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[gemini-code-assist]

Code Review

This pull request primarily updates the Swift toolchain requirement to 6.0 and applies consistent code formatting across the project. The changes are mostly stylistic and align with modern Swift practices, improving readability. I've identified one area in Package.swift where the code for applying Swift settings to targets could be made more concise and idiomatic. The rest of the changes, including updates to .gitignore and test scripts, look good.

[gemini-code-assist]

This loop for adding Swift settings to each target can be written more concisely and readably by using the + operator to append the new settings.

for target in package.targets {
    target.swiftSettings = (target.swiftSettings ?? []) + [
        .enableUpcomingFeature("ExistentialAny"),
        .enableExperimentalFeature("StrictConcurrency"),
    ]
}