[TwigComponent] Fix escaping of Alpine.js attribute keys containing numeric characters

Alpine.js attribute keys like `@input.debounce.500ms` (see https://alpinejs.dev/directives/on#debounce) will now be correctly handled without being escaped.

Author: klausi85

src/TwigComponent/src/ComponentAttributes.php

@@ -80,7 +80,7 @@ public function __toString(): string
             //      xml:*, xmlns:*,
             // - special syntax names (Vue.js, Svelte, Alpine.js, ...)
             //      v-*, x-*, @*, :*
-            if (!ctype_alpha(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
+            if (!ctype_alnum(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
                 $key = (string) $this->escaper->escape($key, 'html_attr');
             }