chore(tests): pin bun version to 1.3.5 due to regression in 1.3.10

Author: tomast1337

.github/workflows/tests.yml

@@ -23,7 +23,9 @@ jobs:
       - name: Install bun
         uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          # Pin to 1.3.5: Bun 1.3.10 has a regression (descriptor.value undefined with NestJS/Swagger).
+          # Fix merged in PR #27527 (Feb 28) but not yet in a release. Revert when 1.3.11+ is latest.
+          bun-version: '1.3.5'
 
       - name: Install dependencies
         run: bun install