chore(deps): bump boto3 from 1.39.8 to 1.40.15 in /examples/chatbots/python #878

Job	Run time
python / Check Python library	43s
python / Check Python chatbot	12s
python / Check Python E2E tests	10s
typescript / Check Typescript library	41s
typescript / Check Typescript E2E tests	32s
typescript / Check Typescript chatbot	33s
cdk / Check Python-based Time Server	1m 52s
cdk / Check Python-based Book Search Server	2m 21s
cdk / Check Python-based Inspiration Server	27s
cdk / Check Typescript-based Cognito stack	23s
cdk / Check Typescript-based Dictionary Server	1m 52s
cdk / Check Python-based MCP Doc Server	1m 51s
cdk / Check Typescript-based Dog Facts Server	1m 49s
cdk / Check Python-based Dad Jokes Server	1m 56s
cdk / Check Typescript-based Weather Alerts Server	1m 27s
cdk / Check Typescript-based Cat Facts Server	1m 34s
	18m 23s

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