Quickly change 1 file in Heroku without downloading the entire application rep

Question

I have a python app in Heroku. There are hundreds of scripts, and several libraries. Now, when I want to enter any (even one line in one file) I do this:

$ git add .
$ git commit -am "make it better"
$ git push heroku master

Then I wait about 5 minutes while Heroku re-installs Python 3.10 and all libraries, and re-uploads all my files. Is it possible to change 1 script in my application and update that one script to Heroku? I expect to make a small change quickly, like I do on my local machine, without having to re-download all the Python libraries.