Use CredScan-suppressed dummy password in sample (#20468)

Author: mccoyp

sdk/videoanalyzer/azure-media-videoanalyzer-edge/samples/sample_lva.py

@@ -33,7 +33,7 @@ def build_pipeline_topology():
 
 def build_live_pipeline():
     url_param = ParameterDefinition(name="rtspUrl", value=url)
-    pass_param = ParameterDefinition(name="rtspPassword", value='testpass')
+    pass_param = ParameterDefinition(name="rtspPassword", value="secret_password")
     live_pipeline_properties = LivePipelineProperties(description="Sample description", topology_name=pipeline_topology_name, parameters=[url_param])
 
     live_pipeline = LivePipeline(name=live_pipeline_name, properties=live_pipeline_properties)