Update project to depend on Swift 5.7

[natecook1000]

This updates the Swift Algorithms package to have a base of Swift 5.7, which is the earliest version supported by these packages.

Checklist

• I've added at least one test that validates that my change is working, if appropriate
• I've followed the code style of the rest of the project
• I've read the Contribution Guidelines
• I've updated the documentation if necessary

[natecook1000]

@swift-ci Please test