deps: update actions/github-script action to v6 (#211)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [actions/github-script](https://togithub.com/actions/github-script) | action | major | `v5` -> `v6` | --- ### Release Notes <details> <summary>actions/github-script</summary> ### [`v6`](https://togithub.com/actions/github-script/compare/v5...v6) [Compare Source](https://togithub.com/actions/github-script/compare/v5...v6) </details> --- ### Configuration 📅 **Schedule**: At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-api-gateway).

Author: renovate-bot