chore(ci): normalize workflow to match shared defaults

Changed test-script from 'vitest run' to 'pnpm run test' to align with
shared workflow defaults across all Socket repos.

Author: jdalton

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       lint-script: 'pnpm run lint'
       node-versions: '[20, 22, 24]'
       os-versions: '["ubuntu-latest", "windows-latest"]'
-      test-script: 'vitest run'
+      test-script: 'pnpm run test'
       test-setup-script: 'pnpm run build'
       type-check-script: 'pnpm run check'
       type-check-setup-script: 'pnpm run build'