Fix ruby-head CI suite

[ashishkeshan]

The ruby-head test suite is currently failing due to:

Failure/Error: require 'pry-byebug'

NameError:
  undefined method `=~' for class `Pry::Code'

which was actually fixed in pry version 0.14.0, but unfortunately, pry-byebug’s latest version only allows for pry version 0.13.0 due to this unresolved issue: deivid-rodriguez/pry-byebug#343

Since pry-byebug is only used locally and not in production systems, I think it's okay to remove it in versions of ruby >= 3.2 (which introduce the issue) to unblock the CI suites for now until pry-byebug begins supporting later versions of pry that incorporate the fix.

[Bestra]

I think this is a reasonable short-term fix. This would need to be addressed for any future work we do, and I like seeing a separate PR for it. 👍 from me, now we'll need another review from the octokit team.