Add macOS 11 Big Sur and Safari 14 to Saucelabs tests (close #875)
Add macOS 11 Big Sur and Safari 14 to Saucelabs tests (close #875)

snowplow/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker