chore: update webmock requirement from ~> 3.19.1 to ~> 3.20.0 in /res…

…ources/google_cloud_platform (#847)

chore(deps-dev): update webmock requirement from ~> 3.19.1 to ~> 3.20.0

Updates the requirements on [webmock](https://github.com/bblimke/webmock) to permit the latest version.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.19.1...v3.20.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kayla Reopelle (she/her) <[email protected]>
Co-authored-by: Ariel Valentin <[email protected]>

resources/google_cloud_platform/opentelemetry-resource-detector-google_cloud_platform.gemspec

@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 1.62'
   spec.add_development_dependency 'rubocop-performance', '~> 1.20'
   spec.add_development_dependency 'simplecov', '~> 0.17'
-  spec.add_development_dependency 'webmock', '~> 3.19.1'
+  spec.add_development_dependency 'webmock', '~> 3.20.0'
   spec.add_development_dependency 'yard', '~> 0.9'
 
   if spec.respond_to?(:metadata)