Stormshield KMaaS 4.2.1 fixes

When performing a migration between two KACLSs or using a backup KACLS, a migration token is generated by the Stormshield KMaaS. It was generated with the wrong time unit for the iat (issued at) and exp (expiration date) fields, which could make it impossible to migrate.

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The Stormshield KMaaS no longer stops unexpectedly if a request parameter has the wrong type when calling the REST API. This error could have been exploited to execute a Denial of Service (DDOS) attack.