Update dependency omniauth-google-oauth2 to '~> 1.2.1'

Gemfile

@@ -77,7 +77,7 @@ gem 'aws-sdk-s3', '~> 1', '>= 1.177.0'
 
 # ImapFolderAgent
 gem 'gmail_xoauth' # support for Gmail using OAuth
-gem 'omniauth-google-oauth2', '~> 1.0.1'
+gem 'omniauth-google-oauth2', '~> 1.2.1'
 
 # Bundler <1.5 does not recognize :x64_mingw as a valid platform name.
 # Unfortunately, it can't self-update because it errors when encountering :x64_mingw.