Correct the Flask version to 3.1.0

Author: hehe7318

CHANGELOG.md

@@ -17,7 +17,7 @@ CHANGELOG
 
 **CHANGES**
 - Upgrade Connexion to ~=2.15.1 (from ~=2.13.0).
-- Upgrade Flask to ~=3.0 (from >=2.2.5,<2.3).
+- Upgrade Flask to ~=3.1.0 (from >=2.2.5,<2.3).
 - Upgrade Werkzeug to ~=3.1 (from ~=2.0) to address [CVE-2024-34069](https://nvd.nist.gov/vuln/detail/cve-2024-34069).
 
 3.14.0