Upgrade pry-shell to 0.5.0

What does this MR do and why?

This MR upgrades the pry-shell gem version to 0.5.0.

The changes are;

1. Auto-connect by default.
2. pry-byebug support by default(can be disabled by binding.pry_shell(with_byebug: false)).
3. Fixes the following warning message;

Loading development environment (Rails 6.1.3.2)
Found plugin pry-shell, but could not require 'pry-shell'
cannot load such file -- pry-shell
[1] pry(main)> 

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