[DRE-maint] Bug#960622: ruby-kramdown: new version available, deprecation warnings against ruby 2.7

[Daniel Kahn Gillmor]

Package: ruby-kramdown
Version: 1.17.0-4

Upstream appears to have version 2.2.1 available.   The current version
emits the following warnings with ruby 2.7+1:

/usr/lib/ruby/vendor_ruby/kramdown-rfc2629.rb:454: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/usr/lib/ruby/2.7.0/open-uri.rb:13: warning: The called method `open' is defined here
/usr/lib/ruby/vendor_ruby/kramdown-rfc2629.rb:454: warning: calling URI.open via Kernel#open is deprecated, call URI.open directly or use URI#open

hopefully the new version resolves these warnings.

Regards,

        --dkg
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