Fix version test to use __version__ instead of hardcoded string

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: yaooqinn

spark_history_cli/tests/test_core.py

@@ -412,9 +412,10 @@ def test_help(self):
         assert "Spark History Server" in result.stdout
 
     def test_version(self):
+        from spark_history_cli import __version__
         result = self._run(["--version"])
         assert result.returncode == 0
-        assert "1.0.1" in result.stdout
+        assert __version__ in result.stdout
 
     def test_apps_no_server(self):
         """When no server is running, should fail gracefully."""