fix(github action): preview acceptance test (#2889)

- should run on changes to files in directory
- fix conflict in pnpm versions

.github/workflows/preview-service-acceptance.yml

@@ -7,11 +7,11 @@ on:
       - .yarnrc.yml .
       - .yarn
       - package.json
-      - packages/frontend-2/type-augmentations/stubs
-      - packages/preview-service
-      - packages/viewer
-      - packages/objectloader
-      - packages/shared
+      - packages/frontend-2/type-augmentations/stubs/**
+      - packages/preview-service/**
+      - packages/viewer/**
+      - packages/objectloader/**
+      - packages/shared/**
 
 jobs:
   preview-service-acceptance:
@@ -43,7 +43,6 @@ jobs:
       - uses: pnpm/action-setup@v4
         name: Install pnpm
         with:
-          version: 9
           run_install: false
       - name: Install Node.js
         uses: actions/setup-node@v4