fix(deps): update dependency yargs-parser to v21.1.1 (#2231)

Currently the `yargs` is not usable in Deno with `.env()`. 
This was fixed in yargs/yargs-parser#432
It was released in yargs-parser v21.0.1
This dependency bump will fix `yargs` for Deno.

Co-authored-by: Benjamin E. Coe <bencoe@google.com>

package.json

@@ -59,7 +59,7 @@
     "require-directory": "^2.1.1",
     "string-width": "^4.2.3",
     "y18n": "^5.0.5",
-    "yargs-parser": "^21.0.0"
+    "yargs-parser": "^21.1.1"
   },
   "devDependencies": {
     "@types/chai": "^4.2.11",