update gotestsum to current master
removes golang.org/x/cryto dependency:
full diff:
# See the License for the specific language governing permissions and
# limitations under the License.
-GO111MODULE=on go install gotest.tools/gotestsum@012a85e34a7ce5554057d512e55dcb54b6f2505e
\ No newline at end of file
+GO111MODULE=on go install gotest.tools/gotestsum@1a9438079330f60c1301fdfacafbfac8763214a5
