Changes

fix(tidb): checkout to minor version of tidb-test for hotfix (#3321)

For the hotfix branch(example release-8.5-20250114-v8.5.0), we need to
checkout the corresponding minimum version of the tidb-test code
(release-8.5.0).

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Signed-off-by: purelind <purelind@gmail.com>
 (commit: 17680e3)