Update dependency flask to v3.1.2

Author: renovate[bot]

requirements.txt

@@ -12,7 +12,7 @@ flask-login==0.6.3 ; python_version >= "3.12" and python_version < "4.0"
 flask-session==0.8.0 ; python_version >= "3.12" and python_version < "4.0"
 flask-sqlalchemy==3.1.1 ; python_version >= "3.12" and python_version < "4.0"
 flask-wtf==1.2.2 ; 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"
 greenlet==3.2.3 ; python_version >= "3.12" and python_version < "3.14" and (platform_machine == "aarch64" or platform_machine == "ppc64le" or platform_machine == "x86_64" or platform_machine == "amd64" or platform_machine == "AMD64" or platform_machine == "win32" or platform_machine == "WIN32")
 gunicorn==23.0.0 ; python_version >= "3.12" and python_version < "4.0"
 idna==3.10 ; python_version >= "3.12" and python_version < "4.0"