chore: drop un-used dequal

I was tried to use `dequal` to replace our own home-baked deep equal,
however I gave up:

- Even with `dequal/lite`, it still check `Date` and `RegExp`, both we
don't actually need
- `dequal` considers `NaN deep equal NaN` where we do not

Thus I have turn to optimize existing impl instead. This dependency can
be removed

Author: SukkaW

packages/shared/package.json

@@ -45,7 +45,6 @@
     "@hey-api/types": "workspace:*",
     "ansi-colors": "4.1.3",
     "cross-spawn": "7.0.6",
-    "dequal": "2.0.3",
     "open": "11.0.0",
     "semver": "7.7.4"
   },