feat: updated suggest jdbc to 8.x

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

• [ ] master (the latest development version)
• [ ] v8.2 (TiDB 8.2 versions)
• [ ] v8.1 (TiDB 8.1 versions)
• [ ] v8.0 (TiDB 8.0 versions)
• [ ] v7.6 (TiDB 7.6 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)
• [ ] v5.3 (TiDB 5.3 versions)
• [ ] v5.2 (TiDB 5.2 versions)
• [ ] v5.1 (TiDB 5.1 versions)

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• [ ] Delete files
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• [ ] Need modification after applied to another branch
• [ ] Might cause conflicts after applied to another branch

[Icemap]

/cc @qiancai

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-26 04:56:34.91225063 +0000 UTC m=+781921.397739463: :ballot_box_with_check: agreed by qiancai.

[qiancai]

/approve

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #17790.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #17791.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #17792.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #17793.