Merge branch 'bump_selenium_webdriver_3.142.7' into 'master'

Bump selenium-webdriver to fix Ruby 2.7 warnings

See merge request gitlab-org/gitlab!43501

Gemfile.lock

@@ -1065,7 +1065,7 @@ GEM
     seed-fu (2.3.7)
       activerecord (>= 3.1)
       activesupport (>= 3.1)
-    selenium-webdriver (3.142.6)
+    selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
     sentry-raven (3.0.4)