gomod(dm): upgrade go-mysql to 1.9.1 (#11630)

[ti-chi-bot]

This is an automated cherry-pick of #11630

What problem does this PR solve?

Issue Number: close #11603

What is changed and how it works?

update github.com/go-mysql-org/go-mysql version from 1.7.1 to 1.9.1, which support connecting to mysql 8.0 with password longer than 19 characters.

Check List

Tests

• Unit test
• Manual test

Manual test: run quick-start dm task and saw no more connection error.

Questions

Will it cause performance regression or break compatibility?

No

Do you need to update user documentation, design documentation or monitoring documentation?

No

Release note

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	bea6755	link	true	/test verify
pull-cdc-integration-storage-test	bea6755	link	true	/test cdc-integration-storage-test

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