[py] Fix type hint on chrome option method

[fergushev]

Description

This is a followup fix to @AutomatedTester's fix (95707f2) which adds string lists to the type hint. Quick code example to repro the bug/fix:

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_experimental_option("excludeSwitches", ["enable-automation"])

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[AutomatedTester]

Thank you for the patch!

[codecov-commenter]

Codecov Report

Merging #9840 (e7111d6) into trunk (e703235) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##            trunk    #9840   +/-   ##
=======================================
  Coverage   44.50%   44.50%           
=======================================
  Files          83       83           
  Lines        5501     5501           
  Branches      249      249           
=======================================
  Hits         2448     2448           
  Misses       2804     2804           
  Partials      249      249           

Impacted Files	Coverage Δ
py/selenium/webdriver/chromium/options.py	53.94% <0.00%> (ø)

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