Install hub CLI on the runner in build.yml

Sometime between August and October 2023,
GitHub removed the `hub` CLI from their runners.
(mislav/hub#3338)
Which we use to upload the built workflows and
attach them to the release. In this change, we update
the build script to explicitly install `hub`.

.github/workflows/build.yml

@@ -39,6 +39,9 @@ jobs:
  draft: false
  prerelease: false
 
+ - name: Install hub CLI for Uploading Release Assets
+ run: brew install hub
+
  - name: Upload Release Assets
  env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}