fix(hris): staff aren't being updated often enough

The job doesn't run often enough, leaving staff sometimes up to 6 hours out of
date.

There were once rumours of rate limits around HRIS's Reports As A Service
(RAAS) API, and so if we'd like to reduce this further we'll need to sync with
the people team.

Jira: IAM-1821

Author: bheesham

serverless-functions/hris_publisher/serverless.yml

@@ -110,7 +110,7 @@ functions:
     handler: handler.handle
     events:
       - schedule:
-          rate: rate(6 hours)
+          rate: rate(3 hours)
           enabled: true
     description: hris-publisher for synchronizing HRIS to identity vault.
     memorySize: 3008 # This is HUGE because cpu allocation is tied to memorySize.