ci: bump actions/checkout to v4

Author: checkout‑bot

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
   Jest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run Tests
         run: |
           yarn install 

.github/workflows/node.js.yml

@@ -19,7 +19,7 @@ jobs:
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with: