fix: replace headless property in browser options class

[emmanuel-ferdman]

PR Summary

This small PR resolves the Selenium deprecation warnings coming from the headless property which you can find in the CI logs:

DeprecationWarning: headless property is deprecated, instead use add_argument('-headless')

[openedx-webhooks]

Thanks for the pull request, @emmanuel-ferdman!

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[mphilbrick211]

Hi @emmanuel-ferdman - thank you for this contribution! Please let me know if you have any questions regarding submitting a CLA form. Thanks!

[e0d]

@emmanuel-ferdman
Your branch is behind the base. I've pulled in changes from master as a merge commit which will update your branch and cause the tests to be re-run.

[emmanuel-ferdman]

@mphilbrick211 I think it was signed.

@e0d Updated, thanks for the review.

[emmanuel-ferdman]

@e0d anything else is needed from my side? 😃

[e0d]

@emmanuel-ferdman sorry for the delay, but was away for the Open edX conference. It looks like there are some quality errors. Can you have a look. I'm not sure what's causing the migration checks to fail, but will look when I have a moment.

[emmanuel-ferdman]

thanks @e0d! I accidentally pushed the wrong commit at first, but it should be all good now 😄