Use latest Chrome driver.

We'll have to assume that GitHub Actions' Ubuntu image is continually updated with the latest Chrome, although there's every likelihood that these tests will sometimes fail if the versions aren't in sync.

If it becomes too much of a problem, remove these tests.

.github/workflows/tests.yml

@@ -97,8 +97,8 @@ jobs:
         run: |
           git reset --hard HEAD
           composer dumpautoload
-      - name: Install Chrome 78 driver
-        run: php artisan dusk:chrome-driver 78
+      - name: Install Chrome driver
+        run: php artisan dusk:chrome-driver
       - name: Start Chrome driver
         run: ./vendor/laravel/dusk/bin/chromedriver-linux > /dev/null 2>&1 &
       - name: Run Laravel Server