Update dependency symfony/polyfill-php81 to ^1.31.0

Author: renovate[bot]

composer.json

@@ -23,7 +23,7 @@
         "react/promise-stream": "^1.2",
         "react/promise-timer": "^1.6",
         "react/socket": "^1.9",
-        "symfony/polyfill-php81": "^1.23",
+        "symfony/polyfill-php81": "^1.31.0",
         "thecodingmachine/safe": "^1.3.3 || ^2.0",
         "wyrihaximus/composer-update-bin-autoload-path": "^1.1.1",
         "wyrihaximus/constants": "^1.6",