Add ostruct dependency to fix warning on Ruby 3.3.5+

[mattbrictson]

Fixes the following warning on Ruby 3.3.5+ and Ruby 3.4:

sshkit-1.23.0/lib/sshkit.rb:29: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.

Closes #541

[tisba]

I also get (sshkit 1.23.0):

/.gem/ruby/3.3.5/gems/sshkit-1.23.0/lib/sshkit.rb:29: warning: logger was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.

There was an overview what is planned to change in terms of stdlib/bundled gems in upcoming Ruby versions, but I cannot find it :(

[mattbrictson]

@tisba what version of net-ssh are you using? The only place I can find where sshkit is doing require 'logger' is in this conditional branch, which should only run for very old versions of net-ssh (< 4.0.0):

sshkit/lib/sshkit/backends/netssh.rb

Lines 68 to 73 in 892d5bf

	# net-ssh < 4.0.0 doesn't have assign_defaults
	unless @default_options.key?(:logger)
	require 'logger'
	@default_options[:logger] = ::Logger.new(STDERR)
	@default_options[:logger].level = ::Logger::FATAL
	end

[tisba]

net-ssh (7.2.3)

But sorry for the noise, I'm pretty sure it's net-ssh's fault. They don't have the logger gem as a dependency.

[mattbrictson]

There was an overview what is planned to change in terms of stdlib/bundled gems in upcoming Ruby versions, but I cannot find it

As of Ruby 3.3.5, here is the list of gems that will no longer be built into future Ruby versions: https://github.com/ruby/ruby/blob/ef084cc8f4958c1b6e4ead99136631bef6d8ddba/lib/bundled_gems.rb#L5-L35

E.g.

"ostruct" => "3.5.0",

means that ostruct will be removed in Ruby 3.5.0, which is what produces this warning:

ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0

[dorianmariecom]

Can a new version be released? :) plz thx

[tisba]

Already has been released as 1.23.1, see https://rubygems.org/gems/sshkit/versions/1.23.1