ci: fix git identity for changesets Version Packages commit (vercel#1357)

Set setupGitUser: false on changesets/action to prevent it from
overwriting our git config with the hardcoded github-actions[bot]
identity. The git identity is now configured in a prior step using
the app-slug output from actions/create-github-app-token.

Author: TooTallNate

.github/workflows/release.yml

@@ -65,6 +65,7 @@ jobs:
           version: pnpm ci:version
           publish: pnpm ci:publish
           createGithubReleases: false
+          setupGitUser: false
         env:
           GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}