Update pry requirement from ~> 0.14.2 to ~> 0.15.0

Updates the requirements on [pry](https://github.com/pry/pry) to permit the latest version.
- [Release notes](https://github.com/pry/pry/releases)
- [Changelog](https://github.com/pry/pry/blob/master/CHANGELOG.md)
- [Commits](pry/pry@v0.14.2...v0.15.0)

---
updated-dependencies:
- dependency-name: pry
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

oxidized.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'git',                 '~> 2'
   s.add_development_dependency 'minitest',            '~> 5.18'
   s.add_development_dependency 'mocha',               '~> 2.1'
-  s.add_development_dependency 'pry',                 '~> 0.14.2'
+  s.add_development_dependency 'pry',                 '~> 0.15.0'
   s.add_development_dependency 'rake',                '~> 13.0'
   s.add_development_dependency 'rubocop',             '~> 1.68.0'
   s.add_development_dependency 'rubocop-minitest',    '~> 0.36.0'