fix(deps): update dependency @octoherd/octokit to v4 (#129)

BREAKING CHANGE: Node 18+ is required

Author: renovate[bot]

.github/workflows/test.yml

@@ -10,9 +10,8 @@ jobs:
     strategy:
       matrix:
         node:
-          - 14
-          - 16
           - 18
+          - 20
     name: Node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v3