Bump flask from 3.1.1 to 3.1.3 in /sandbox #141

Job	Run time
Set CI/CD metadata	7s
Commit stage / Check Markdown format	5s
Commit stage / Check file format	5s
Commit stage / Check English usage	8s
Commit stage / Scan dependencies	43s
Commit stage / Count lines of code	9s
Commit stage / Scan secrets	8s
Commit stage / Lint and validate OpenAPI	32s
	1m 57s

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