fix: update QA workflow to use bun for build command

This commit modifies the `.github/workflows/qa.yml` file to replace the `bunx next typegen` command with `bun run build`, ensuring the build process aligns with the latest tooling and maintains the existing environment variables.

Author: roderik

.github/workflows/qa.yml

@@ -157,8 +157,6 @@ jobs:
         if: github.event_name == 'pull_request' || github.event_name == 'push'
         id: qa-tests
         run: |
-          bunx next typegen
-          bun run check-types
           bun run build
         env:
           NEXT_PUBLIC_POSTHOG_KEY: ${{ secrets.NEXT_PUBLIC_POSTHOG_KEY }}