build: fix e2e rate limit failures

[devversion]

• Since the webdriver-manager always tries to query the versions of all Selenium drivers, we currently run into rate limit failures that cause the E2E tests to not run properly.

[jelbourn]

LGTM

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "continuous-integration/travis-ci/pr" is failing
     missing required labels: target: *

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