chore: remove redundant generate-versioned-ipas step in site-audit.yml

Same as deploy.yml — npm run build already triggers the prebuild script,
so the explicit step was running it twice.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: JoeMatt

.github/workflows/site-audit.yml

@@ -42,9 +42,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Generate versioned IPAs
-        run: node scripts/generate-versioned-ipas.js
-
       - name: Build site
         run: npm run build