chore: update actions/checkout to v6

Author: EvanSchleret

.github/workflows/ci.yml

@@ -25,11 +25,11 @@ jobs:
       fail-fast: false
       matrix:
         bun:
-          - "1.3.10"
+          - "1.3.11"
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Bun
         uses: oven-sh/setup-bun@v2