[gemspec] Remove public_suffix version constraint (#16569)
[gemspec] Remove public_suffix version constraint (#16569)

Was added in https://github.com/fastlane/fastlane/pull/10168 because
newer versions of public_suffix didn't support all Ruby versions that
fastlane did. However fastlane now requires Ruby 2.4 or above while
public_suffix supports 2.3 and higher.

https://github.com/fastlane/fastlane/pull/16408
https://github.com/weppos/publicsuffix-ruby/blob/v4.0.5/CHANGELOG.md#400
fastlane/fastlane,lacostej/fastlane,kohtenko/fastlane,icecrystal23/fastlane,Econa77/fastlane,cpk1/fastlane,taquitos/fastlane,kazuhidet/fastlane,Econa77/fastlane,kazuhidet/fastlane,mbogh/fastlane,Econa77/fastlane,mbogh/fastlane,bolom/fastlane,icecrystal23/fastlane,bassrock/fastlane,KrauseFx/fastlane,bassrock/fastlane,cpk1/fastlane,lacostej/fastlane,KrauseFx/fastlane,KrauseFx/fastlane,lacostej/fastlane,KrauseFx/fastlane,brbulic/fastlane,icecrystal23/fastlane,brbulic/fastlane,kazuhidet/fastlane,lacostej/fastlane,KrauseFx/fastlane,bassrock/fastlane,bolom/fastlane,KrauseFx/fastlane,taquitos/fastlane,Econa77/fastlane,bassrock/fastlane,icecrystal23/fastlane,fastlane/fastlane,icecrystal23/fastlane,bolom/fastlane,kazuhidet/fastlane,brbulic/fastlane,mbogh/fastlane,nafu/fastlane,taquitos/fastlane,fastlane/fastlane,taquitos/fastlane,nafu/fastlane,cpk1/fastlane,bolom/fastlane,taquitos/fastlane,KrauseFx/fastlane,Econa77/fastlane,nafu/fastlane,mbogh/fastlane,bolom/fastlane,bolom/fastlane,mbogh/fastlane,kazuhidet/fastlane,nafu/fastlane,nafu/fastlane,brbulic/fastlane,fastlane/fastlane,brbulic/fastlane,cpk1/fastlane,fastlane/fastlane,nafu/fastlane,Econa77/fastlane,nafu/fastlane,mbogh/fastlane,Econa77/fastlane,bassrock/fastlane,lacostej/fastlane,bassrock/fastlane,cpk1/fastlane,cpk1/fastlane,brbulic/fastlane,taquitos/fastlane,brbulic/fastlane,kazuhidet/fastlane,taquitos/fastlane,icecrystal23/fastlane,cpk1/fastlane,fastlane/fastlane,kohtenko/fastlane,lacostej/fastlane,mbogh/fastlane,kazuhidet/fastlane,bolom/fastlane