Update CONTRIBUTING to reflect the need to build

Builds aren't happening automatically (or required to happen
manually), so we need to update the release steps to include
building the project.

CONTRIBUTING.md

@@ -106,6 +106,7 @@ Here are a few things you can do that will increase the likelihood of your pull
 _Note: these instructions are for maintainers_
 
 1. Update the version number in [package.json](https://github.com/actions/dependency-review-action/blob/main/package.json) and run `npm i` to update the lockfile.
+1. Update the dist files by running `npm run build` and `npm run package`
 1. Go to [Draft a new
    release](https://github.com/actions/dependency-review-action/releases/new)
    in the Releases page.
@@ -137,8 +138,8 @@ To do this just checkout `main`, force-create a new annotated tag, and push it:
 git tag -fa v4 -m "Updating v4 to 4.0.1"
 git push origin v4 --force
 ```
-</details>
 
+</details>
 
 ## Resources