docs: update quick start version from 5.3.2 to 5.4.0

[RongtongJin]

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What is the purpose of the change

update quick start version from 5.3.2 to 5.4.0

Brief changelog

update quick start version from 5.3.2 to 5.4.0

Verifying this change

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[RockteMQ-AI]

Summary

Updates all quickstart documentation from RocketMQ 5.3.2 to 5.4.0 across 6 files (both English i18n and versioned docs). Clean, consistent version bump covering download links, directory names, and docker image tags.

Findings

• [Info] Multiple files — The docker image tag is also updated to 5.4.0. Please confirm the apache/rocketmq:5.4.0 image is available on Docker Hub before merging.
• [Info] versioned_docs/version-5.0/02-quickStart/02quickstartWithDocker.md — The broker.conf volume mount path still references rocketmq-5.3.2 in the comment on line ~84. Consider verifying all version references are consistent.

Overall a clean and necessary version update. LGTM. ✅

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Automated review by RockteMQ-AI