Bump the docs version to 8.17.4 (#3189)

Passed in 26m 49s

Triggered by a doc change in elastic/kibana PR: #214993
Preview url: https://kibana_bk_214993.docs-preview.app.elstc.co

Agent for job :pipeline::arrow_up: Upload Pipeline: .buildkite/build_pr_pipeline.yml (0195cdf5-1199-46ba-8693-50bfcaa870e0): bk-agent-prod-k8s-1742917180914770127 (k8s) - [metrics] [events]

Agent for job setup (0195cdf6-1a75-41e9-b5a3-ae28c971cc14): bk-agent-prod-k8s-1742917230083620814 (k8s) - [metrics] [events]

Agent for job 0195cdf6-1a73-46ae-9df5-d2210250d94f: bk-agent-prod-k8s-1742917230276447862 (k8s) - [metrics] [events]

Agent for job :hammer: Build docs PR (0195cdf6-1a76-4926-b837-89f66d1b3194): bk-agent-prod-gcp-1742917281847247573 (gcp) - [metrics] [events]

Agent for job teardown (0195cdf6-1a78-4fb1-a76d-61c91c490b3f): bk-agent-prod-k8s-1742918787078194347 (k8s) - [metrics] [events]

:pipeline:猬嗭笍 Upload Pipeline: .buildkite/build_pr_pipeline.ymlbuildkite-agent pipeline upload .buildkite/build_pr_pipeline.yml
Waited 44s
Ran in 25s
.buildkite/scripts/cancel_running_pr.sh || true.buildkite/scripts/cancel_running_pr.sh || true
Waited 24s
Ran in 22s
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/ae124baf1e3da6f5b3bdf470b57428064fde96b9" \ && -d '{"state":"pending","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/293081'","description":"Build started","context":"buildkite/'docs-build-pr'"}'
Waited 25s
Ran in 2s
馃敤 Build docs PR.buildkite/scripts/build_pr.sh
Waited 1m 32s
Ran in 21m 55s
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 ${VAULT_GITHUB_TOKEN}" \ && -H "X-GitHub-Api-Version: 2022-11-28" \ && "https://api.github.com/repos/elastic/kibana/statuses/ae124baf1e3da6f5b3bdf470b57428064fde96b9" \ && -d '{"state":"'$status_state'","target_url":"'https://buildkite.com/elastic/docs-build-pr/builds/293081'","description":"Build finished","context":"buildkite/'docs-build-pr'"}'
Waited 2m 26s
Ran in 3s
Total Job Run Time: 22m 47s