Bump @octokit/rest from 18.0.6 to 18.0.15 (#106)

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 18.0.6 to 18.0.15.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](octokit/rest.js@v18.0.6...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

@@ -27,7 +27,7 @@
     "@actions/core": "1.2.6",
     "@actions/exec": "1.0.4",
     "@actions/github": "4.0.0",
-    "@octokit/rest": "18.0.6",
+    "@octokit/rest": "18.0.15",
     "micromatch": "4.0.2",
     "pretty-bytes": "5.4.1",
     "size-plugin-core": "0.0.9"