Allow `npm`-Based Formatters to Pin Transitive Dependencies by Populating `overrides` in `package.json`

When using an npm package to format code, and that npm package has a range dependency onto another library, the formatting output can change silently. This just happened to us: we use `prettier-plugin-sql`, which has a `^`-dependency on `sql-formatter`. `sql-formatter` released a new version that changed the formatting output, and our project’s build broke because the checked-in SQL files didn’t match the expected format.

Proposal: add the configuration method `dependencyOverrides` to `PrettierFormatterStep`. This method accepts a `Map` to populate the [`overrides` field](https://docs.npmjs.com/cli/v11/configuring-npm/package-json#overrides) in the generated `package.json`. This mechanism could work exactly like the one populating the `devDependencies`.