Possible issue with tracking_column_type => "timestamp" in 8.1.1

After updating from 7x to 8.1.1 any pipeline that uses tracking_column_type => "timestamp" fails with the error

[2023-06-16T14:37:50,485][ERROR][logstash.javapipeline ][Questions] Pipeline error {:pipeline_id=>"Questions", :exception=>#<Psych::DisallowedClass: Tried to load unspecified class: Time

tracking_column_type => "numeric" still works as expected in the existing pipelines.

Is anyone else experiencing these errors?

I think that this PR (committed yesterday) is intended to fix that. Specifically "Ruby 3.1 comes with Psych 4 which switched the alias of load from unsafe_load to safe_load".

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