Update plugins.md - add yarn-plugin-fetch (#5384)

Update plugins.md

Co-authored-by: Maël Nison <nison.mael@gmail.com>
(cherry picked from commit 127ad8c)

packages/gatsby/content/features/plugins.md

@@ -109,6 +109,8 @@ This is just a centralized list of third-party plugins to make discovery easier.
 
 - [**yarn-scripts-cache**](/~https://github.com/rgischk/yarn-scripts-cache) by [**Roman Gischkowski**](/~https://github.com/rgischk) - A Yarn Berry plugin to cache script execution results. Previous build results can be restored, even from a remote cache server. This allows for build result sharing with a team of developers, significantly decreasing build times and eliminating downtime.
 
+- [**yarn-plugin-fetch**](/~https://github.com/devthejo/yarn-plugin-fetch) by [**DevTheJo**](/~https://github.com/devthejo) - Optimized yarn workflow for docker build. Don't re-download all your dependencies on each package.json change. Like [pnpm fetch](https://pnpm.io/cli/fetch) but for yarn and better (exta-features like workspace focus support).
+
 - [**git-hooks**](/~https://github.com/trufflehq/yarn-plugin-git-hooks#readme) by [**TruffleHQ**](/~https://github.com/trufflehq) - adds support for [git hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks)
 
 - [**yarn-plugin-env**](/~https://github.com/MDReal32/yarn-plugin-env) by [**MDReal Aliyev**](/~https://github.com/MDReal32) - A Yarn Berry plugin to load environment variables from files to `process.env` on startup any script.