ci: use oven-sh/setup-bun@v2 in pr-check to fix Bun download HTTP 400 on ubuntu-24.04

Author: 123vivekr

.github/workflows/pr-check.yml

@@ -22,9 +22,9 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
         with:
-          bun-version: 1.x
+          bun-version: latest
 
       - name: Cache Bun dependencies
         uses: actions/cache@v4