Update actions/checkout action to v6

.github/workflows/build.yaml

@@ -16,7 +16,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Login to registry
       if: ${{ inputs.push }}

.github/workflows/main.yaml

@@ -15,7 +15,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Setup go
       uses: actions/setup-go@v6