minor #540 Remove redundant readonly definition (llupa)

This PR was merged into the main branch.

Discussion
----------

 Remove redundant `readonly` definition

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        |
| License       | MIT

Commits
-------

8073af6 Remove redundant `readonly` definition

Author: OskarStark

src/platform/src/Bridge/Ollama/OllamaMessageChunk.php

@@ -20,10 +20,10 @@
      * @param array<string, mixed> $message
      */
     public function __construct(
-        public readonly string $model,
-        public readonly \DateTimeImmutable $created_at,
-        public readonly array $message,
-        public readonly bool $done,
+        public string $model,
+        public \DateTimeImmutable $created_at,
+        public array $message,
+        public bool $done,
     ) {
     }