Update dependency @ember/optional-features to v2.1.0 #1054

Job	Run time
test bundlesize	1m 36s
Test php backend (7.2)	14s
lint	1m 4s
test against additional browser in BrowserStack	2m 27s
Test php backend (7.3)	15s
test against Chrome	2m 19s
Test php backend (7.4)	15s
test CSP in .htaccess	1m 1s
test against Firefox	2m 30s
Test php backend (8.0)	19s
Test php backend (8.1)	15s
Test php backend (8.2)	49s
	13m 4s

Provide feedback