Bump the docs version to 8.17.4 (#3189)

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Triggered by a doc change in elastic/kibana PR: #216040
Preview url: https://kibana_bk_216040.docs-preview.app.elstc.co

Agent for job :pipeline::arrow_up: Upload Pipeline: .buildkite/build_pr_pipeline.yml (0195d29d-51a4-459c-aeee-5375810e5b16): bk-agent-prod-k8s-1742995287876343500 (k8s) - [metrics] [events]

Agent for job setup (0195d29d-a97a-4840-b4d3-bb69bf3e05fe): bk-agent-prod-k8s-1742995319880985901 (k8s) - [metrics] [events]

Agent for job 0195d29d-a979-42a1-b9d4-a2d1dd9534cf: bk-agent-prod-k8s-1742995320079439157 (k8s) - [metrics] [events]

Agent for job :hammer: Build docs PR (0195d29d-a97b-4632-ba27-e4628e03594d): bk-agent-prod-gcp-1742995336980746231 (gcp) - [metrics] [events]

Agent for job teardown (0195d29d-a97b-4e0f-b32f-02b48f2bc504): bk-agent-prod-k8s-1742996806576762367 (k8s) - [metrics] [events]

:pipeline:猬嗭笍 Upload Pipeline: .buildkite/build_pr_pipeline.ymlbuildkite-agent pipeline upload .buildkite/build_pr_pipeline.yml
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.buildkite/scripts/cancel_running_pr.sh || true.buildkite/scripts/cancel_running_pr.sh || true
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setupcurl -s -L \ && -X POST \ && -H "Accept: application/vnd.github+json" \ && -H "Authorization: Bearer ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/kibana/statuses/4610d8ff52c093eba17e4d22efdb1046fc153d89" \ && -d '{"state":"pending","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294078'","description":"Build started","context":"buildkite/'docs-build-pr'"}'
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馃敤 Build docs PR.buildkite/scripts/build_pr.sh
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teardownstatus_state=failure && if [ $(buildkite-agent step get "outcome" --step "build-pr") == "passed" ]; then && status_state=success && fi && export status_state && curl -s -L \ && -X POST \ && -H "Accept: application/vnd.github+json" \ && -H "Authorization: Bearer ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/kibana/statuses/4610d8ff52c093eba17e4d22efdb1046fc153d89" \ && -d '{"state":"'$status_state'","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294078'","description":"Build finished","context":"buildkite/'docs-build-pr'"}'
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Total Job Run Time: 23m 17s