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

Author: elastic-renovate-prod[bot]

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
 
     - name: Install terraform
       uses: hashicorp/setup-terraform@v3