Update dart_apitoolHash constant value

[dcharkes]

Rolling in:

• tech: bump analyzer bmw-tech/dart_apitool#256

[goderbauer]

LGTM

[auto-submit]

autosubmit label was removed for dart-lang/ecosystem/397, because - The status or check suite health / changelog / run changelog health check has failed. Please fix the issues identified (or deflake) before re-applying this label.

[github-actions]

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