Update deprecated error handling

[brendon1555]

Describe the bug
Change the way we are handling errors. See deprecation warning in logs below.

To Reproduce
Trigger any error (eg push to repo that doesnt exist)
ghs secrets:set -s ENV -f .env.prod -r FAKE_REPO -b

Expected behavior
No deprecation warnings.

Logs

> ghs secrets:set -s ENV -f .env.prod -r repo -b
Deprecation: [@octokit/request-error] `error.code` is deprecated, use `error.status`.
    at RequestError.get (/Users/brendonlees/.config/yarn/global/node_modules/@octokit/request-error/dist-node/index.js:29:17)
    at Object.prettyPrint [as default] (/Users/brendonlees/.config/yarn/global/node_modules/@anomalyhq/github-secrets-cli/node_modules/@oclif/errors/lib/errors/pretty-print.js:31:22)
    at Object.exports.handle (/Users/brendonlees/.config/yarn/global/node_modules/@anomalyhq/github-secrets-cli/node_modules/@oclif/errors/lib/handle.js:18:46)
    at module.exports (/Users/brendonlees/.config/yarn/global/node_modules/@anomalyhq/github-secrets-cli/node_modules/@oclif/errors/handle.js:1:49) {
  name: 'Deprecation'
}
    HttpError: Not Found
    Code: 404

[Nabeelhassan]

@brendon1555 I have given a merge request. Could you please verify it?

[Nabeelhassan]

you might wanna update this issue..