fix(deps): update @octokit to latest' (#131)

BREAKING CHANGE: Node 16 is no longer officially supported, as @octokit
dropped support as well. Node 16 will be out of maintenance on September
11, see https://nodejs.dev/en/about/releases/

Author: gr2m

.github/workflows/test.yml

@@ -12,8 +12,8 @@ jobs:
     strategy:
       matrix:
         node_version:
-          - 16
           - 18
+          - 20
 
     steps:
       - uses: actions/checkout@v3