br: drop a fixme in br since its 8.0+ now

[yihong0618]

What problem does this PR solve?

Issue Number: ref: #36474

Problem Summary:

as tidb is 8.0+ now so this can drop maybe

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-chi-bot]

Hi @yihong0618. Thanks for your PR.

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[ti-chi-bot]

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[lance6716]

maybe it means BR can run on an old version cluster. @Leavrth can you take a look?