fix(deps): bump @octokit/rest from 18.0.14 to 18.0.15 (#635)

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 18.0.14 to 18.0.15.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](octokit/rest.js@v18.0.14...v18.0.15)

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

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

package.json

@@ -43,7 +43,7 @@
     }
   },
   "dependencies": {
-    "@octokit/rest": "^18.0.14",
+    "@octokit/rest": "^18.0.15",
     "atom-modal-views": "^1.0.6",
     "deep-object-diff": "^1.1.0",
     "diff": "^5.0.0",