Add an automatic workflow to update winget pkgs

Currently, bazelisk can be installed via winget using `winget install Bazel.Bazelisk`. However, winget-pkgs is updated manually. I wonder whether it is possible to add an Github action to update winget-pkgs automatically. There are some tools such as [winget-create](https://github.com/microsoft/winget-create?tab=readme-ov-file#using-windows-package-manager-manifest-creator-in-a-cicd-pipeline) and [komac](https://github.com/russellbanks/Komac?tab=readme-ov-file#usage-with-github-actions-winget-releaser-).

Start by reading the linked winget-create and Komac GitHub Actions documentation, especially their CI/CD usage and authentication requirements. Determine how a Bazelisk release can trigger an update to winget-pkgs, and define completion as a workflow that reliably submits updated package metadata without manual intervention.

Written by the indexing model from the issue text.