update dev-guide-sample-application-python-mysql-connector

[shawn0915]

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fix #15782

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[rpaik]

/label 2024-tidb-docs-dash

[rpaik]

Thanks for contributing to TiDB Docs Dash @shawn0915!

[Icemap]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-11 09:15:02.597253992 +0000 UTC m=+521092.181507665: ☑️ agreed by Icemap.
• 2024-01-24 13:33:15.95566001 +0000 UTC m=+967637.519957711: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-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-7.1: #16324.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #16325.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16326.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16328.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16330.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16332.