use openwhisk-client-js 3.21.7 (#86)

diff --git a/package.json b/package.json
index 150013c..d019f70 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   ],
   "dependencies": {
     "minimist": "^1.2.0",
-    "openwhisk": "^3.21.4",
+    "openwhisk": "^3.21.7",
     "terser": "^3.8.2"
   },
   "devDependencies": {