Lock chromedriver version

There is an apparent issue with chromedriver installation when
there is a new release of chrome that doesn't have a corresponding
version of chromedriver.

Orb 1.4.6 release was supposed to fix this but we are once again
seeing the error, so we are attempting to lock the crome version to
see if we can bypass this error.

Refs
CircleCI-Public/browser-tools-orb#96
CircleCI-Public/browser-tools-orb#75 (comment)

.circleci/config.yml

@@ -80,7 +80,9 @@ jobs:
           ruby_version: << parameters.ruby_version >>
           bundler_version: << parameters.bundler_version >>
       - samvera/rubocop
-      - browser-tools/install-chrome
+      - browser-tools/install-chrome:
+          chrome-version: 120.0.6099.109 # see https://github.com/CircleCI-Public/browser-tools-orb/pull/96
+          replace-existing: true
       - browser-tools/install-chromedriver
       - run:
           name: Check Chrome install