fix(@angular-devkit/benchmark): update minimist to 1.2.6

Closes angular#22872

Author: alan-agius4

packages/angular_devkit/benchmark/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@angular-devkit/core": "0.0.0",
     "ansi-colors": "4.1.1",
-    "minimist": "1.2.5",
+    "minimist": "1.2.6",
     "pidusage": "2.0.21",
     "pidtree": "0.5.0",
     "rxjs": "6.6.3",