config: update token-limit max value

[djshow832]

What is changed, added or deleted? (Required)

Close #17195

Set the max value of token-limit to 1048576.

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

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• master (the latest development version)
• v8.1 (TiDB 8.1 versions)
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• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
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• v6.1 (TiDB 6.1 versions)
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• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)

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

• This PR is translated from:
• Other reference link(s): config: set max token limit to 1M tidb#53361

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

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[Oreoxmt]

@djshow832 Could you please confirm whether this change applies to v8.2 and later?

[djshow832]

@djshow832 Could you please confirm whether this change applies to v8.2 and later?

Yes, it applies to v8.2 and later.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-11 09:08:26.182983631 +0000 UTC m=+455660.236295556: ☑️ agreed by qiancai.
• 2024-06-13 02:20:35.891371936 +0000 UTC m=+603989.944683852: ☑️ agreed by Oreoxmt.