chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/performance.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Use Latest Node.js
         uses: actions/setup-node@v6

.github/workflows/size-limit.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - uses: andresz1/size-limit-action@v1
         with: