chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Use Node ${{ matrix.node }}
         uses: actions/setup-node@v1

.github/workflows/size.yml

@@ -6,7 +6,7 @@ jobs:
     env:
       CI_JOB_NUMBER: 1
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - uses: andresz1/size-limit-action@v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}