This change adds a GitHub Dependabot configuration to enable daily checks for dependency updates.
[See the docs for more information.][1]
[1]:https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/configuration-options-for-dependency-updates
This config enables checking for dependencies in the root `package.json` file (`directory`) every weekday (`schedule.interval`) only for lockfile updates, ignoring any new versions that would require package manifest changes. (if necessary, `versioning-strategy`). This is all restricted to the organization's `@metamask/*` packages.
