Lock Renovate to lowest supported PHP version

Author: curry684

.github/renovate.json

@@ -2,5 +2,9 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
-  ]
+  ],
+  "constraints": {
+    "php": "8.2"
+  },
+  "constraintsFiltering": "strict"
 }