Update dependency flask to v3.1.2

Author: renovate[bot]

requirements.txt

@@ -6,7 +6,7 @@ cssmin==0.2.0 ; python_version >= "3.12" and python_version < "4.0"
 flake8==7.3.0 ; python_version >= "3.12" and python_version < "4.0"
 flask-assets==2.1.0 ; python_version >= "3.12" and python_version < "4.0"
 flask-sock==0.7.0 ; python_version >= "3.12" and python_version < "4.0"
-flask==3.1.1 ; python_version >= "3.12" and python_version < "4.0"
+flask==3.1.2 ; python_version >= "3.12" and python_version < "4.0"
 gunicorn==23.0.0 ; python_version >= "3.12" and python_version < "4.0"
 h11==0.16.0 ; python_version >= "3.12" and python_version < "4.0"
 iniconfig==2.1.0 ; python_version >= "3.12" and python_version < "4.0"