Update sample app urlib3 from 2.6.0 to 2.6.3 to fix CVE-2026-21441 (opensearch-project#6399)

Signed-off-by: Taylor Gray <tylgry@amazon.com>

Author: graytaylor0

examples/trace-analytics-sample-app/sample-app/requirements.txt

@@ -8,6 +8,6 @@ opentelemetry-sdk==1.25.0
 protobuf==4.25.8
 requests==2.32.4
 setuptools==78.1.1
-urllib3==2.6.0
+urllib3==2.6.3
 werkzeug==3.0.6
 zipp==3.19.1