chore: update dependency async to ^3.2.6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -33,7 +33,7 @@
   ],
   "license": "MIT",
   "dependencies": {
-    "async": "^3.2.4",
+    "async": "^3.2.6",
     "bson": "^1.1.6",
     "debug": "^4.3.4",
     "loopback-connector": "^5.0.1",