test/helper.rb -TimeoutEveryTestCase - set all timeouts to 45 sec [changelog skip]

[MSP-Greg]

Description

While working on another PR, I noticed one job (ubuntu-18.04 truffleruby-head) where the log output showed all tests passing, but the job hit the time limit set in the Actions workflow file.

Inspecting the log, it showed three two minute 'pauses' in the log output, which is the current setting in test/helper.rb for non MRI jobs.

A brief look at CI logs seemed to show that the longest test takes approx 30 sec.

This PR changes the settings in TimeoutEveryTestCase to 45 sec for all jobs. Hopefully, this will result in fewer jobs hitting the ten minute time limit, and hence, passing.

Note: testing in my fork with this patch still had jobs timing out (only non MRI jobs). So, there are still problems...

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