chore(deps): update dependency spatie/phpunit-watcher to v1.21.3

Author: renovate-bot

composer.json

@@ -13,7 +13,7 @@
   "require-dev": {
     "codedungeon/phpunit-result-printer": "0.26.2",
     "phpunit/phpunit": "8.4.3",
-    "spatie/phpunit-watcher": "1.21.1"
+    "spatie/phpunit-watcher": "1.21.3"
   },
   "autoload": {
     "psr-4": {