readme: update benchmark image

Author: krichprollsch

README.md

@@ -26,7 +26,9 @@ Fast web automation for AI agents, LLM training, scraping and testing:
 - Exceptionally fast execution (11x faster than Chrome)
 - Instant startup
 
-<img width=500px src="https://cdn.lightpanda.io/assets/images/benchmark_2024-12-04.png">
+<a href="https://github.com/lightpanda-io/demo">
+<img alt="Lightpanda benchmark graph" width=500px src="https://cdn.lightpanda.io/assets/images/benchmark_2025-02-18.png">
+</a>
 
 See [benchmark details](https://github.com/lightpanda-io/demo).