Update fog-core requirement from = 1.43.0 to = 1.45.0

Updates the requirements on [fog-core](https://github.com/fog/fog-core) to permit the latest version.
- [Release notes](https://github.com/fog/fog-core/releases)
- [Changelog](https://github.com/fog/fog-core/blob/master/changelog.md)
- [Commits](https://github.com/fog/fog-core/commits/v1.45.0)

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

Author: dependabot-preview[bot]

sensu-plugins-aws.gemspec

@@ -38,7 +38,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.add_runtime_dependency 'fog',               '1.32.0'
   # 1.44 requires xmlrpc which only supports >= ruby 2.3
   # https://github.com/fog/fog-core/issues/206
-  s.add_runtime_dependency 'fog-core',          '1.43.0'
+  s.add_runtime_dependency 'fog-core',          '1.45.0'
   s.add_runtime_dependency 'nokogiri',          ['>= 1.10.4', '< 2.0']
   s.add_runtime_dependency 'rest-client',       '1.8.0'
   s.add_runtime_dependency 'right_aws',         '3.1.0'