chore(dashboard): update TiDB Dashboard to v7.5.4-ec6d9999a [release-7.5]

[baurine]

What problem does this PR solve?

Issue Number: ref #4257 #8611

Update TiDB Dashboard to v7.5.4-ec6d9999a.

Release note

None

[ti-chi-bot]

Hi @baurine. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[HuSharp]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HuSharp, rleungx

The full list of commands accepted by this bot can be found here.

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• OWNERS [HuSharp,rleungx]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-25 08:03:58.930627148 +0000 UTC m=+1639508.671051088: ☑️ agreed by rleungx.
• 2024-09-25 08:20:44.294546554 +0000 UTC m=+1640514.034970490: ☑️ agreed by HuSharp.