const Octokit is deprecated

[MauricioFauth]

https://github.com/phpmyadmin/phpmyadmin/runs/793102151?check_suite_focus=true

Run dessant/lock-threads@v2
[@octokit/rest] `const Octokit = require("@octokit/rest")` is deprecated. Use `const { Octokit } = require("@octokit/rest")` instead
[@octokit/rest] `const Octokit = require("@octokit/rest")` is deprecated. Use `const { Octokit } = require("@octokit/rest")` instead

[netniV]

This issue is actually caused by the GitHub Toolkit action, see actions/toolkit#333 and was resolved in release 2.1.1 (See https://github.com/actions/toolkit/blob/master/packages/github/RELEASES.md).

I've created a PR to update the dependancy for it #18