chore: update Bun version in CI workflow to 1.2.8

.github/workflows/linux-release.yml

@@ -22,7 +22,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version: 1.2.8
       - name: Build Frontend
         env:
           CI: ""