build(deps): bump @oclif/core from 1.5.3 to 1.6.0 in /core (#15)

Bumps [@oclif/core](https://github.com/oclif/core) from 1.5.3 to 1.6.0.
- [Release notes](https://github.com/oclif/core/releases)
- [Changelog](https://github.com/oclif/core/blob/main/CHANGELOG.md)
- [Commits](oclif/core@v1.5.3...v1.6.0)

---
updated-dependencies:
- dependency-name: "@oclif/core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

core/package.json

@@ -31,7 +31,7 @@
   "dependencies": {
     "@oclif/command": "^1",
     "@oclif/config": "^1",
-    "@oclif/core": "1.5.3",
+    "@oclif/core": "1.6.0",
     "@oclif/plugin-help": "5.1.12",
     "@oclif/plugin-not-found": "^2.2.1",
     "@secman/spinner": "0.1.3",