update the external links that contains master to release-4.0

[TomShawn]

What is changed, added or deleted? (Required)

Update the external GitHub links that contain /master/ and /release-3.0/ to /release-4.0/.

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

• master (the latest development version)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)
• v3.1 (TiDB 3.1 versions)
• v3.0 (TiDB 3.0 versions)
• v2.1 (TiDB 2.1 versions)

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

• This PR is translated from:
• Other reference link(s): update the external links that contains master to release-5.0 #6054

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

[TomShawn]

/assign
/status PTAL
/translation doing

[TomShawn]

/cc @yikeke

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• yikeke

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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[TomShawn]

/label require-LGT1
/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cf27816

[TomShawn]

/remove-translation doing
/translation done