v8.5: bump up the latest version to v8.5.4

[qiancai]

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

Added TiDB v8.5.4 compatibility changes link in the upgrade guide and updated the TiDB version in variables.json to 8.5.4.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from: v8.5: bump up the latest version to v8.5.4 docs-cn#21085
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[gemini-code-assist]

Summary of Changes

Hello @qiancai, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to update the documentation to reflect the release of TiDB v8.5.4. It includes bumping the version number in relevant configuration files and adding a link to the compatibility changes in the upgrade guide. Please note that the provided patch only shows the addition of a test file, which may not fully reflect the described changes.

Highlights

• Version Bump: The latest TiDB version has been updated to v8.5.4.
• Documentation Update: A compatibility changes link for TiDB v8.5.4 has been added to the upgrade guide.
• Configuration Update: The TiDB version in variables.json has been updated to 8.5.4.

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[gemini-code-assist]

Code Review

This pull request adds a new file temp.md. However, the title and description indicate a version bump to v8.5.4. Please ensure the PR's title and description accurately reflect the changes. My review includes a suggestion to add a newline at the end of the new file, which is a common convention for text files.

[Oreoxmt]

/cc @Oreoxmt

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-11-18 07:01:13.804755927 +0000 UTC m=+1376723.247785806: ☑️ agreed by Oreoxmt.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@Oreoxmt: Your lgtm message is repeated, so it is ignored.

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