Remove CI workflow chromedriver version lock

This reverts d2620e7, as Selenium is
now failing again.  The currently installed Chrome version is 118.
Hopefully nanasess/setup-chromedriver#200 has
been fixed by now.

.github/workflows/build-and-test.yml

@@ -67,8 +67,6 @@ jobs:
       - uses: browser-actions/setup-chrome@latest
       - run: chrome --version
       - uses: nanasess/setup-chromedriver@v2
-        with:
-          chromedriver-version: '115.0.5790.170'  # https://github.com/nanasess/setup-chromedriver/issues/200
 
       - name: "Set up PostgreSQL"
         uses: harmon758/postgresql-action@v1