Update Yarn to v4.9.4 (#297)

| datasource | package      | from  | to    |
| ---------- | ------------ | ----- | ----- |
| npm        | @yarnpkg/cli | 4.9.3 | 4.9.4 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
   "license": "MIT",
   "main": "src/main.ts",
   "name": "lucacome-docker-image-update-checker",
-  "packageManager": "[email protected].3",
+  "packageManager": "[email protected].4",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/lucacome/docker-image-update-checker.git"