pin langfuse major version 2

There will be breaking changes in version 3. I recommend pinning version 2 in this space to avoid any issues.

app.py

@@ -33,7 +33,7 @@ def run_langfuse():
     }
 
     # Pull Langfuse Docker image
-    subprocess.run(['docker', 'pull', 'langfuse/langfuse:latest'], check=True)
+    subprocess.run(['docker', 'pull', 'langfuse/langfuse:2'], check=True)
 
     # Prepare Docker run command
     docker_cmd = [
@@ -46,7 +46,7 @@ def run_langfuse():
     for key, value in env_vars.items():
         docker_cmd.extend(['-e', f'{key}={value}'])
 
-    docker_cmd.append('langfuse/langfuse:latest')
+    docker_cmd.append('langfuse/langfuse:2')
 
     # Run the container
     subprocess.run(docker_cmd, check=True)