fix(ci): lock cargo-sort install

[lybcodes]

What is changed and how it works?

Issue Number: N/A (GitHub Issues disabled)

What's Changed:

The prowjob `pull-unit-test` in pingcap-qe/ci repo runs `make ci_fmt_check`, which installs `cargo-sort v1.0.9` during `pre-format`.

Although the `cargo-sort` version is pinned, the install command did not use `--locked`, so Cargo still resolved transitive dependencies from the latest crates.io index. A newer transitive dependency (`clap_lex v1.1.0`) now requires Rust 2024 edition support, which is not available in the CI Cargo version, causing the format check setup to fail before tests run.

This PR adds `--locked` to the `cargo-sort v1.0.9` install command so Cargo uses the dependency versions from the crate's lockfile.

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

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

Side effects

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

Release note

[pingcap-cla-assistant]

All committers have signed the CLA.

[lybcodes]

/hold

[lybcodes]

/retest

[lybcodes]

/test pull-unit-test

[lybcodes]

/test pull-unit-test

[lybcodes]

Flaky Cases
shared::snapshot::test_basic_concurrent_snapshot
Symptom: Repeated failures occur in the shared::snapshot test suite.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-04-29 08:09:58.044852737 +0000 UTC m=+2758203.250212794: ☑️ agreed by CalvinNeo.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo

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• HACKED_OWNERS [CalvinNeo]

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[CalvinNeo]

/retest

[lybcodes]

/unhold

[ti-chi-bot]

@lybcodes: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test	a34346a	link	true	/test pull-unit-test

Full PR test history. Your PR dashboard.

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[lybcodes]

/override pull-unit-test

[ti-chi-bot]

/override pull-unit-test