ZosFilesBaseHandler shows a ts error (`async` on `abstract` method)

[zFernand0]

Error:

Code: https://github.com/zowe/zowe-cli/blob/215b74c4c9309aff9e554715a2ee79d7cb7ed2ff/packages/cli/src/zosfiles/ZosFilesBase.handler.ts#L87

Originally reported by @sarthakjdev

[sarthakjdev]

Hey This bug has been resolved as in the current version, so I think if nomore changes are required, we can close this issue. Have a look here.

Thanks!