Update GitHub Actions to v4 (#42)

Author: emmanuelm41

.github/workflows/checks.golang.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions/setup-go@v3

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
   Test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v3
         with:
           go-version: '1.21'