fix(deps): update dependency @octokit/rest to v18 (#297)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
     "Gregor Martynus (https://twitter.com/gr2m)"
   ],
   "dependencies": {
-    "@octokit/rest": "^17.0.0",
+    "@octokit/rest": "^18.0.0",
     "@semantic-release/error": "^2.2.0",
     "aggregate-error": "^3.0.0",
     "bottleneck": "^2.18.1",