Update hubspot-api-client.gemspec

[artinboghosian]

Can't upgrade typheous gem to latest (1.6.0) since this gemspec forces 1.4.0. There are no breaking changes between 1.4.0 and 1.6.0.

https://github.com/typhoeus/typhoeus/blob/master/CHANGELOG.md

1.6.0

Full Changelog

• Add Ruby 4.0 to CI matrix and update checkout action to v6.
  (Geremia Taglialatela, #744)
• Require Ethon >= 0.18.0, removing the upper bound constraint.
  (Geremia Taglialatela, #742)
• Update RubyDoc link in gemspec metadata.
  (Felipe Mesquita, #737)
• Update gem version badge and remove Code Climate badge.
  (Felipe Mesquita, #736)

1.5.0

Full Changelog

• Update gemspec with metadata and remove extra files from the bundled gem.
  (Felipe Mesquita, #734)
• Require Ruby 2.6+ and simplify Gemfile.
  (Felipe Mesquita, #733)
• Add support for URI objects in Typhoeus.stub().
  (Katelyn Schiesser, #732)
• Add explicit require for logger and ostruct gems for Ruby 3.5+ compatibility.
  (Felipe Mesquita, #729)
• Add Ruby 3.4 to CI matrix.
  (y-yagi, #728)
• Support curl 8.9 error message changes in tests.
  (Mamoru TASAKA, #724)
• Add Ruby 3.2 and 3.3 to CI, drop Ruby 2.5, lock ethon < 0.16.0.
  (y-yagi, #716)
• Fix typo in comment: "reponse" → "response".
  (George Brocklehurst, #700)

1.4.1

Full Changelog

• Fix to run CI with Ruby 3.0.
  (mishina, #699)
• Replace CI status badge from Travis to GH Actions.
  (mishina, #698)
• Added getter for redirect_url attribute.
  (Adrien Rey-Jarthon, #697)
• CI: Adjust ruby versions and MacOS runs.
  (Holger Arndt, #696)
• Allow performing curl --upload-file.
  (Arian Faurtosh, #695)
• Add getter for size_upload, size_download, speed_upload, speed_download values.
  (Ryo Nakano, #692)
• Use bundle add instead.
  (Glauco Custodio, #691)
• Travis -> Github actions.
  (John Mortlock, #689)
• Add global timeout and connecttimeout to config.
  (Teck Wan Wong, #685)
• Update README.md.
  (Hussain Akram, #677)

1.4.0

Full Changelog