Update actions/checkout action to v4

Update actions/checkout from 2 to 4

Change-type: patch

Author: balena-renovate[bot]

.github/workflows/publish-docs.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
           persist-credentials: false