Fix usage of response in http_request.rst samples

[glmnet]

Description:

Simple fixes of http request samples as I'm testing now, the response object is in shared pointer so it needs the arrow operator

error: 'class std::shared_ptr<esphome::http_request::HttpContainer>' has no member named 'status_code'

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[jesserockz]

Woops, did not see this. Sorry @glmnet. Thanks for trying to update it.

It got merged in #4049