Loosen aws-sdk-core Requirement (#13)

We are currently targeting a specific minor version of the
`aws-sdk-core` gem, despite not having any particular need for that
level of specificity in this developer-environment-only gem. It also
makes it more difficult to update the version of `aws-sdk-core` we
target in our main repo.

This PR loosens our requirement to let us pick up newer 3.x versions
than the one we currently target. We could probably support older
versions, too, if we have a need; happy to make that tweak if anyone
would prefer.

Author: Hamms

aws-google.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'aws-sdk-core', '~> 3.211.0'
+  spec.add_dependency 'aws-sdk-core', '~> 3.211'
   spec.add_dependency 'google-apis-core', '~> 0.11.3' # Newest version compatible with code-dot-org's google_drive>googleauth dependency
   spec.add_dependency 'launchy', '~> 3.0.1'