Update fog requirement from = 1.32.0 to = 2.1.0

Updates the requirements on [fog](https://github.com/fog/fog) to permit the latest version.
- [Release notes](https://github.com/fog/fog/releases)
- [Changelog](https://github.com/fog/fog/blob/master/CHANGELOG.md)
- [Commits](fog/fog@v1.32.0...v2.1.0)

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

Author: dependabot-preview[bot]

sensu-plugins-aws.gemspec

@@ -35,7 +35,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
 
   s.add_runtime_dependency 'aws-sdk',           '~> 3.0'
   s.add_runtime_dependency 'erubis',            '2.7.0'
-  s.add_runtime_dependency 'fog',               '1.32.0'
+  s.add_runtime_dependency 'fog',               '2.1.0'
   # 1.44 requires xmlrpc which only supports >= ruby 2.3
   # https://github.com/fog/fog-core/issues/206
   s.add_runtime_dependency 'fog-core',          '1.45.0'