Update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/actions.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v6.0.2
+        uses: actions/checkout@v6.0.3
 
       - name: Set up Go
         uses: actions/setup-go@v6.4.0
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v6.0.2
+        uses: actions/checkout@v6.0.3
 
       - name: Golangci-lint
         uses: golangci/golangci-lint-action@v9.2.0
@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v6.0.2
+        uses: actions/checkout@v6.0.3
         with:
           fetch-depth: 0