update mysql version for syncdiff test

[Leavrth]

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[gemini-code-assist]

Summary of Changes

Hello @Leavrth, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the version of the MySQL database used within the syncdiff integration test pipeline. This change ensures that the test environment utilizes a more recent MySQL version, which is crucial for maintaining compatibility and validating system behavior against current database standards.

Highlights

• Dependency Update: The MySQL image used for the syncdiff integration test has been updated from version 5.7 to 8.0.21.

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[pingcap-cla-assistant]

All committers have signed the CLA.

[gemini-code-assist]

Code Review

This pull request updates the MySQL version used in the syncdiff integration test from 5.7 to 8.0.21. This is a good step to modernize the test environment. My review includes a suggestion to consider using a more recent patch release of MySQL 8.0 for better security and to stay current, or to add a comment if this specific version is required for compatibility reasons.

[gemini-code-assist]

The MySQL version is being updated to 8.0.21, which was released in July 2020. While pinning versions is good for reproducibility in tests, this version is quite dated and may be missing important security patches and bug fixes.

Please consider using a more recent patch version of MySQL 8.0 if one is available in your hub.pingcap.net/jenkins registry. This would help keep the test environment more secure and aligned with modern standards.

If this specific version is required for a particular reason (e.g., compatibility), it would be beneficial to add a code comment explaining why. For example:

# Using mysql:8.0.21 due to <specific reason>.
image: hub.pingcap.net/jenkins/mysql:8.0.21

This would greatly improve long-term maintainability.

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Summary:
The pull request updates the MySQL version from 5.7 to 8.0.43 in the pod-pull_syncdiff_integration_test.yaml file used for integration testing. The approach taken is straightforward, simply changing the MySQL image tag. Overall, the change seems necessary for updating dependencies.

Critical Issues:

• No critical issues found in the provided diff.

Code Improvements:

• It would be beneficial to ensure that the new MySQL version 8.0.43 is compatible with the existing setup and won't introduce any breaking changes or conflicts with other components in the integration test environment.

Best Practices:

• Add a comment to document the reason for updating the MySQL version and any potential implications or considerations related to this change in the pod-pull_syncdiff_integration_test.yaml file. This can help future developers understand the context behind the version update.

  # Update MySQL version to 8.0.43 for compatibility with other components