Update small-time to support Mojo 0.25.7

[thatstoasty]

Checklist

• My recipe.yaml file specifies which version(s) of MAX is compatible with my project (see here for an example). If not, my package is compatible with both 24.5 and 24.6.
• License file is packaged (see here for an example).
• Set the build number to 0 (for new packages, or if the version changed).
• Bumped the build number (if the version is unchanged).

[Copilot]

Pull request overview

This PR updates the small_time package from version 25.4.1 to 25.7.0 to support Mojo 0.25.7. The changes modernize the package configuration by migrating from the deprecated max dependency pattern to the newer mojo-compiler dependency specification with explicit version constraints.

Key Changes:

• Package version updated from 25.4.1 to 25.7.0 with Mojo 0.25.7 support
• Migration from max host dependencies to mojo-compiler build/host/run dependencies
• Test configuration modernized to use dynamic test discovery pattern and source files

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