fix: bump swift sdk to 0.26.1 (#3333) #293

Job	Run time
prepare-for-test	12s
graphql-auth-directive-test	0s
graphql-user-pool-test	0s
graphql-iam-test	0s
graphql-lazy-load-test	0s
rest-user-pool-test	0s
functional-test / api-functional-test-iOS	13m 54s
functional-test / api-functional-test-tvOS	11m 32s
functional-test / api-functional-test-watchOS	20m 2s
graphql-lambda-auth-test / api-graphql-lambda-auth-test-iOS	8m 16s
graphql-lambda-auth-test / api-graphql-lambda-auth-test-tvOS	8m 16s
graphql-lambda-auth-test / api-graphql-lambda-auth-test-watchOS	7m 18s
rest-iam-test / api-rest-iam-test-iOS	9m 10s
rest-iam-test / api-rest-iam-test-tvOS	8m 28s
rest-iam-test / api-rest-iam-test-watchOS	10m 1s
	1h 37m 9s

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