Unfortunately, Google doesn't make AMR32 (armv7l) builds of ChroreDriver anymore. The latest version of chromedriver-linux32 was released for version 2.33

But there is a solution, people from the Raspbian project have compiled chromium-chromedriver version for the armhf platform and added it to the repo.

sudo apt-get install chromium-chromedriver

And you will have the latest available version of the ChromeDriver installed and ready to use together with Selenium.