Bump mist to support Mojo 26.1.0

[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

Updates the mist community recipe to track a newer upstream release intended to be compatible with Mojo/MAX 26.1.

Changes:

• Bump mist recipe version to 26.1.0 and update the upstream git rev.
• Update the pinned mojo_version constraint for build/test dependencies.

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