Outdated dependency to `shelljs` is printing unwanted warnings

[ArchangelX360]

Describe the bug
Dependency shelljs in version 0.8.3 is printing warnings with specific versions of NodeJS, see shelljs/shelljs#992.

As @kubernetes/client-node depends on it, we are seeing those warnings at runtime:

(node:29099) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
    at emitCircularRequireWarning (node:internal/modules/cjs/loader:703:11)
    at Object.get (node:internal/modules/cjs/loader:717:5)
    at Object._register [as register] ([REDACTED]/node_modules/@kubernetes/client-node/node_modules/shelljs/src/common.js:453:12)
    at Object.<anonymous> ([REDACTED]/node_modules/@kubernetes/client-node/node_modules/shelljs/src/cat.js:4:8)
    at Module._compile (node:internal/modules/cjs/loader:1109:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1138:10)
    at Module.load (node:internal/modules/cjs/loader:989:32)
    at Function.Module._load (node:internal/modules/cjs/loader:829:14)
    at Module.require (node:internal/modules/cjs/loader:1013:19)
    at require (node:internal/modules/cjs/helpers:93:18)
// ...

Upgrading to shelljs 0.8.4 should be sufficient to resolve the issue.

** Client Version **
0.12.3

** Server Version **
N/A

Expected behavior
No warnings

Environment (please complete the following information):

• OS: MacOS BigSur
• NodeJS Version 16.3.0

Additional context

[brendandburns]

Closing this since #685 merged and 0.15.0 has been pushed with the fix.