tiup&dm: update a wrong tidb version

[shichun-0415]

What is changed, added or deleted? (Required)

The tidb version used in the example should be 5.3.0, not 5.4.0. See the following code example:

Release Version: v5.3.0
Git Commit Hash: 20626babf21fc381d4364646c40dd84598533d66
Git Branch: heads/refs/tags/v5.3.0
UTC Build Time: 2021-11-29 08:29:49
Go Version: go version go1.16.4 linux/amd64

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)
• v6.6 (TiDB 6.6 versions)
• v6.5 (TiDB 6.5 versions)
• v6.4 (TiDB 6.4 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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

• This PR is translated from:
• 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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Oreoxmt

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[Oreoxmt]

LGTM

[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: 12afb5c

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #13000.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #13001.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #13002.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #13003.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #13004.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #13005.