build(deps-dev): bump carthage-software/mago from 1.19.0 to 1.20.1

Bumps [carthage-software/mago](https://github.com/carthage-software/mago) from 1.19.0 to 1.20.1.
- [Release notes](https://github.com/carthage-software/mago/releases)
- [Commits](carthage-software/mago@1.19.0...1.20.1)

---
updated-dependencies:
- dependency-name: carthage-software/mago
  dependency-version: 1.20.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -74,7 +74,7 @@
     "twig/twig": "~3.24.0"
   },
   "require-dev": {
-    "carthage-software/mago": "~1.19.0",
+    "carthage-software/mago": "~1.20.1",
     "doctrine/instantiator": "~2.1.0",
     "mikey179/vfsstream": "~1.6.12",
     "phpbench/phpbench": "^1.6",