fix: update http gem to 4.4.0

[MosesMendoza]

This PR is related to IBM/ruby-sdk-core#33

I was integrating with the Ruby SDK in a rails app, which runs ruby 2.7.2. I wasn't able to initialize an IamAuthenticator object in that lib and traced it down to the http gem. Relevant stack trace portion:

[5] pry(#<Api::V1::AnalysesController>)> exception.backtrace
=> ["/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/http-4.1.1/lib/http/response/body.rb:52:in `force_encoding'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/http-4.1.1/lib/http/response/body.rb:52:in `to_s'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/token_managers/jwt_token_manager.rb:85:in `request'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/token_managers/iam_token_manager.rb:54:in `request_token'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/token_managers/jwt_token_manager.rb:30:in `token'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/token_managers/iam_token_manager.rb:33:in `initialize'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/authenticators/iam_authenticator.rb:28:in `new'",
 "/Users/moses/development/foo/vendor/bundle/ruby/2.7.0/gems/ibm_cloud_sdk_core-1.1.2/lib/ibm_cloud_sdk_core/authenticators/iam_authenticator.rb:28:in `initialize'",

I came across this fix in the http gem repo that references the frozen string error. It was backported to http gem version 4.3.0. This PR updates the gem dependency, but it conflicted with the dependency in the ruby-sdk-core repo so I updated that one as well in this PR. After this fix (and the one in that repo) the code ran fine in rails on ruby 2.7.2 I'm running the project from gem sources in github at the moment, but here's a PR in case you want to update officially. This PR changes the dep to 4.4.x, but 4.1 -> 4.4 should be backwards-compatible. I'm not an expert at minitest but it seems all the tests pass with these changes (at least the ones triggered by bundle exec rake.

Cheers

[CLAassistant]

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[jeff-arn]

@MosesMendoza thanks for opening this contribution! It looks like we would also need to bump the http dep in the ruby core, so we will look into that and see if we can update the core to resolve the build issues here.

[jeff-arn]

This would need to specify the latest core version if we merged it into the core.