workflow/docs: Update to actions/checkout@v4 & dependabot: Update github-actions weekly

[travier]

workflow/docs: Update to actions/checkout@v4

---

dependabot: Update github-actions weekly

[travier]

Note that the action that we're using to build the docs is deprecated: https://github.com/helaili/jekyll-action

That will be for a future PR.

[ericcurtin]

/ok-to-test

[ericcurtin]

Hmmmm, what's the trick for this build "ci/prow/fcos-e2e" ?

[cgwalters]

Hmmmm, what's the trick for this build "ci/prow/fcos-e2e" ?

It doesn't run on doc-only changes, needs an
/override ci/prow/fcos-e2e

[openshift-ci]

@cgwalters: Overrode contexts on behalf of cgwalters: ci/prow/fcos-e2e

In response to this:

Hmmmm, what's the trick for this build "ci/prow/fcos-e2e" ?

It doesn't run on doc-only changes, needs an
/override ci/prow/fcos-e2e

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