Update vcr requirement from ~> 4.0 to ~> 6.2

Updates the requirements on [vcr](https://github.com/vcr/vcr) to permit the latest version.
- [Release notes](https://github.com/vcr/vcr/releases)
- [Changelog](https://github.com/vcr/vcr/blob/master/CHANGELOG.md)
- [Commits](vcr/vcr@v4.0.0...v6.2.0)

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

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

signalwire.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 0.67'
   spec.add_development_dependency 'ruby-prof', '~> 0.17'
   spec.add_development_dependency 'simplecov', '~> 0.16'
-  spec.add_development_dependency 'vcr', '~> 4.0'
+  spec.add_development_dependency 'vcr', '~> 6.2'
   spec.add_development_dependency 'webmock', '~> 3.5'
 
   spec.add_dependency 'twilio-ruby', '~> 5.0'