secret-handshake: update cases_test.go
secret-handshake: update cases_test.go

Re-generate cases_test.go with canonical-data.json,
resulting in only a "Commit:" line change.

No test data changed, so no testVersion change.

robphoenix/exercism-go,leenipper/xgo,exercism/xgo,exercism/xgo,leenipper/xgo,robphoenix/exercism-go