Updated the "Install drivers via selenium-manager" CI step

As we now are only testing Selenium version 2.21 or greater I removed the check to see the correct
method name for getting the binaries with Selenium Manage.

.github/workflows/CI.yml

@@ -60,11 +60,7 @@ jobs:
         pip install -U --pre robotframework==${{ matrix.rf-version }}
     - name: Install drivers via selenium-manager
       run: |
-        if [[ ${{ matrix.selenium-version }} == '4.20.0' || ${{ matrix.selenium-version }} == '4.21.0' ]]; then
-          SELENIUM_MANAGER_EXE=$(python -c 'from selenium.webdriver.common.selenium_manager import SeleniumManager; sm=SeleniumManager(); print(f"{str(sm._get_binary())}")')
-        else
-          SELENIUM_MANAGER_EXE=$(python -c 'from selenium.webdriver.common.selenium_manager import SeleniumManager; sm=SeleniumManager(); print(f"{str(sm.get_binary())}")')
-        fi 
+        SELENIUM_MANAGER_EXE=$(python -c 'from selenium.webdriver.common.selenium_manager import SeleniumManager; sm=SeleniumManager(); print(f"{str(sm._get_binary())}")')
         echo "$SELENIUM_MANAGER_EXE"
         echo "WEBDRIVERPATH=$($SELENIUM_MANAGER_EXE --browser chrome --debug | awk '/INFO[[:space:]]Driver path:/ {print $NF;exit}')" >> "$GITHUB_ENV"
         echo "$WEBDRIVERPATH"