Backport of add value length check to approle createHMAC into release/1.9.x #14764
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Backport
This PR is auto-generated from #14746 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
Prevent clients from issuing approle login requests with unbounded input requiring SHA256 HMAC calculation by adding a limit check.