Pin actions/checkout action to eef6144

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
     container: golang:1.23-alpine
     steps:
     - name: checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
     - name: install prereqs
       run: apk add --no-cache --update build-base
     - name: build