Update dependency @size-limit/preset-small-lib to v12

Author: renovate[bot]

assets/package.json

@@ -41,7 +41,7 @@
         "@eslint/compat": "^1.4.0",
         "@hotwired/stimulus": "^3.0.1",
         "@size-limit/esbuild": "^11.1.4",
-        "@size-limit/preset-small-lib": "^11.1.4",
+        "@size-limit/preset-small-lib": "^12.0.0",
         "@symfony/stimulus-testing": "^2.0.1",
         "eslint": "^9.0.0",
         "eslint-config-prettier": "^10.0.0",