Bump civicrm/composer-downloads-plugin from 3.0.1 to 4.0.0

Bumps [civicrm/composer-downloads-plugin](https://github.com/civicrm/composer-downloads-plugin) from 3.0.1 to 4.0.0.
- [Release notes](https://github.com/civicrm/composer-downloads-plugin/releases)
- [Commits](civicrm/composer-downloads-plugin@v3.0.1...v4.0.0)

---
updated-dependencies:
- dependency-name: civicrm/composer-downloads-plugin
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: composer.json

@@ -21,7 +21,7 @@
   },
   "require-dev": {
     "automattic/vipwpcs": "^3.0",
-    "civicrm/composer-downloads-plugin": "^3.0",
+    "civicrm/composer-downloads-plugin": "^4.0",
     "google/cloud-storage": "^1.0",
     "mikey179/vfsstream": "1.6.11",
     "mustache/mustache": "^2",