chore(deps): update dependency serverless-appsync-plugin to v2.9.1 #1216

Job	Run time
Setup	2m 36s
Teardown accounts API	1m 30s
Teardown accounts warm up	2m 17s
Teardown accounts queue	3m 14s
Teardown accounts reports	1m 54s
Teardown accounts notifications	1m 35s
Teardown accounts data	2m 21s
Teardown accounts storage	2m 37s
Teardown anti virus	3m 10s
	21m 14s

Provide feedback