Update rspec-mocks requirement from < 3.13.3 to < 3.13.9

Updates the requirements on [rspec-mocks](https://github.com/rspec/rspec) to permit the latest version.
- [Changelog](https://github.com/rspec/rspec/blob/rspec-mocks-v3.13.8/rspec-mocks/Changelog.md)
- [Commits](rspec/rspec@rspec-mocks-v3.13.2...rspec-mocks-v3.13.8)

---
updated-dependencies:
- dependency-name: rspec-mocks
  dependency-version: 3.13.8
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -52,7 +52,7 @@ group(:test) do
   gem "rspec", "~> 3.1", require: false
   gem "rspec-expectations", ["~> 3.9", "!= 3.9.3"]
   gem "rspec-its", "~> 1.1", require: false
-  gem 'rspec-mocks', '< 3.13.3', require: false # breaking change afterwards: https://github.com/rspec/rspec-mocks/pull/1596
+  gem 'rspec-mocks', '< 3.13.9', require: false # breaking change afterwards: https://github.com/rspec/rspec-mocks/pull/1596
   gem 'vcr', '~> 6.1', require: false
   gem 'webmock', '~> 3.0', require: false
   gem 'webrick', '~> 1.7', require: false