Bump the docs version to 8.17.4 (#3189)

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Triggered by a doc change in elastic/docs-content PR: #917

Agent for job :pipeline::arrow_up: Upload Pipeline: .buildkite/build_pr_pipeline.yml (0195d29b-68e0-464a-a755-cfe487cdbb53): bk-agent-prod-k8s-1742995173386784409 (k8s) - [metrics] [events]

Agent for job 0195d29c-24cc-4cd5-8ce0-92a0795f7524: bk-agent-prod-k8s-1742995207981682648 (k8s) - [metrics] [events]

Agent for job setup (0195d29c-24cd-45a4-be12-1de252178828): bk-agent-prod-k8s-1742995208184078095 (k8s) - [metrics] [events]

Agent for job :hammer: Build docs PR (0195d29c-24ce-47fd-b5f3-e468cf9800d5): bk-agent-prod-gcp-1742995223883058215 (gcp) - [metrics] [events]

Agent for job teardown (0195d29c-24cf-4dd3-b2cf-9f6e8798982f): bk-agent-prod-k8s-1742995304475461797 (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/docs-content/statuses/317e0b9bb1499d17be48cc7d4907f61f8d629159" \ && -d '{"state":"pending","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294077'","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 ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/docs-content/statuses/317e0b9bb1499d17be48cc7d4907f61f8d629159" \ && -d '{"state":"'$status_state'","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/294077'","description":"Build finished","context":"buildkite/'docs-build-pr'"}'
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Total Job Run Time: 45s