chore(deps): update phpunit packages (#4)

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

Author: renovate[bot]

composer.json

@@ -3,8 +3,8 @@
   "description": "A WordPress tool suite for building data-driven interfaces with a clean extensible architecture.",
   "repositories": [],
   "require-dev": {
-    "phpunit/phpunit": "^9.6",
-    "yoast/phpunit-polyfills": "^2.0"
+    "phpunit/phpunit": "^9.6.31",
+    "yoast/phpunit-polyfills": "^2.0.5"
   },
   "require": {},
   "autoload": {