Fix Malfunctioning Rake Task clear_passed_dates

[CovenantHuman]

Description https://rubyforgood.slack.com/archives/C010Z8RK8E6/p1630018874022900

Make this rake task not cause the above error. It's creating an invalid something and it should not be.

BugsnagAPP  4:01 PM
Event in production from casa in clear_passed_dates (details)

Unhandled error
ActiveRecord::RecordInvalid: Validation failed: Date must be in the past
Location
lib/tasks/scheduler.rake:13 - block (2 levels) in <main>

Existing gem(s), file(s) needing updating, changing or deleting lib/tasks/scheduler.rake

New file(s) needing creating None