chore(deps): update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   unit-tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
         with:
           fetch-depth: 2
       - uses: actions/setup-go@v6.4.0

.github/workflows/go.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6.0.2
+    - uses: actions/checkout@v6.0.3
 
     - name: Set up Go
       uses: actions/setup-go@v6.4.0