Bump the docs version to 8.17.4 (#3189)

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Triggered by a doc change in elastic/ingest-docs PR: #1665
Preview url: https://ingest-docs_bk_1665.docs-preview.app.elstc.co

Agent for job :pipeline::arrow_up: Upload Pipeline: .buildkite/build_pr_pipeline.yml (0195d29a-2ad9-46b9-942f-2fc7768cd3ac): bk-agent-prod-k8s-1742995091578830862 (k8s) - [metrics] [events]

Agent for job 0195d29a-e12c-4dac-9c36-8fbd4d2558bc: bk-agent-prod-k8s-1742995124583509112 (k8s) - [metrics] [events]

Agent for job setup (0195d29a-e12d-4a48-8fe8-4c8b37801861): bk-agent-prod-k8s-1742995124376077319 (k8s) - [metrics] [events]

Agent for job :hammer: Build docs PR (0195d29a-e12e-4102-b75f-1dd12fff37c6): bk-agent-prod-gcp-1742995140482454709 (gcp) - [metrics] [events]

Agent for job teardown (0195d29a-e12f-490e-9f10-4a046f063b07): bk-agent-prod-k8s-1742996320783773887 (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/ingest-docs/statuses/b8803d9aacf28fc34728782e472704cc92e831e0" \ && -d '{"state":"pending","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294074'","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 ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/ingest-docs/statuses/b8803d9aacf28fc34728782e472704cc92e831e0" \ && -d '{"state":"'$status_state'","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294074'","description":"Build finished","context":"buildkite/'docs-build-pr'"}'
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Total Job Run Time: 19m 42s