0.23.2

This release is the last to support Python 3.7

• Updated dependency to urllib3>=2 and requests>=2.30.0. See #635
• Fixed issue when custom adapters were sending only positional args. See #642
• Expose unbound_on_send method in RequestsMock class. This method returns new function
  that is called by RequestsMock instead of original send method defined by any adapter.