Strip whitespace in IssueData selected text

Part of work on issue #5979

src/Psalm/Internal/Analyzer/IssueData.php

@@ -154,7 +154,7 @@ public function __construct(
         $this->file_name = $file_name;
         $this->file_path = $file_path;
         $this->snippet = $snippet;
-        $this->selected_text = $selected_text;
+        $this->selected_text = trim($selected_text);
         $this->from = $from;
         $this->to = $to;
         $this->snippet_from = $snippet_from;