Update newrelic_rpm.gemspec

[washu]

Change rubocop to 1.57.2, as 1.54 breaks an installation using bundler 1.17, fix was posted to robucop and a new release was created.

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Overview

This change updates the rubocop version, to one that works in bundler 1 and bundler 2 environments.
1.54 will fail under bundler 1, with conflicting version of base64. the fix in rubocop release corrects this issue

Submitter Checklist:

• Rubocup fix

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• Perform code review
• Add performance label
• Perform appropriate level of performance testing
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[fallwith]

Thank you, @washu, for helping keep us compatible with Bundler v1 which we still need to test with. Your contribution is much appreciated!

[Earlopain]

This gem itself still depends on base64 like rubocop used to, is that not the same problem for these older bundler versions?

[washu]

This gem doesnt explicitly require base64 i.e. it doesnt do
s.add_runtime_dependency('base64', '~> 0.1.1') in the gemspec.

Which is what rubocop was doing, they took the same approach rack took, which was jsut implment the encode fucntion and not require the entire gem.

[Earlopain]

Ah, I see. The high version constraint was the problem. I missed that, thank you.