Bump the docs version to 8.17.4 (#3189)

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Triggered by a doc change in elastic/kibana PR: #213375
Preview url: https://kibana_bk_213375.docs-preview.app.elstc.co

Agent for job :pipeline::arrow_up: Upload Pipeline: .buildkite/build_pr_pipeline.yml (0195d29a-65e0-48ce-b721-9b86673572fd): bk-agent-prod-k8s-1742995108979748302 (k8s) - [metrics] [events]

Agent for job setup (0195d29a-e5b7-4b99-82e6-11fa3cc71843): bk-agent-prod-k8s-1742995140390676508 (k8s) - [metrics] [events]

Agent for job 0195d29a-e5b6-4be7-b937-72333cd179fe: bk-agent-prod-k8s-1742995140684880201 (k8s) - [metrics] [events]

Agent for job :hammer: Build docs PR (0195d29a-e5b8-4740-a154-36f9b5e4fbdd): bk-agent-prod-gcp-1742995157677570593 (gcp) - [metrics] [events]

Agent for job teardown (0195d29a-e5b8-42eb-979f-6d903fe91f46): bk-agent-prod-k8s-1742996542380610174 (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/6e6b15eb86f899eb1d2ace8e1e848cac355e0920" \ && -d '{"state":"pending","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294075'","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 ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/kibana/statuses/6e6b15eb86f899eb1d2ace8e1e848cac355e0920" \ && -d '{"state":"'$status_state'","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294075'","description":"Build finished","context":"buildkite/'docs-build-pr'"}'
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Total Job Run Time: 22m 10s