Backport of fix race condition in string generator helper into release/1.13.x #19900
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Backport
This PR is auto-generated from #19875 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
A data race in vault/helper/random.(*StringGenerator).validateConfig() was exposed by new text coverage that was recently introduced.
and
Failure: https://app.circleci.com/pipelines/github/hashicorp/vault/51983/workflows/d654323c-baa8-4985-9838-a4131f8900f5/jobs/607405/steps
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