Restore a phpdoc

v3.0.1 removed this line at 79dff0b#diff-ece1cc9e2cbefb0d1c511f88ab22703e9a402b9ca071df66704f1106c1433ad4L116 (in PR #80), however it isn't covered by a typehint so broke static analysis checks in consuming applications/packages using this interface

src/LoggerInterface.php

@@ -89,6 +89,7 @@ public function debug(string|\Stringable $message, array $context = []): void;
     /**
      * Logs with an arbitrary level.
      *
+     * @param mixed $level
      * @param mixed[] $context
      *
      * @throws \Psr\Log\InvalidArgumentException