Merge pull request #2121 from grafana/testing/v0.6.1

Update k6-jslib-testing references to version 0.6.1

Author: oleiade

docs/sources/k6/_index.md

@@ -22,7 +22,7 @@ cascade:
   JSLIB_AWS_VERSION: 0.14.0
   JSLIB_PYROSCOPE_VERSION: 1.0.2
   JSLIB_TEMPO_VERSION: 1.0.1
-  JSLIB_TESTING_VERSION: 0.5.0
+  JSLIB_TESTING_VERSION: 0.6.1
   JSLIB_UTILS_VERSION: 1.4.0
 versioned: true
 versioned_next: true