fix(deps): update dependency flask to v3 [security]

Author: renovate[bot]

pyproject.toml

@@ -29,7 +29,7 @@ certifi = "^2024.0.0" # Pinned for security reasons: https://github.com/cds-snc/
 debugpy = "^1.8.12"
 email-validator = "1.3.1"
 environs = "9.5.0"
-Flask = "2.3.3"
+Flask = "3.1.3"
 Flask-Babel = "2.0.0"
 Flask-Caching = "1.11.1"
 Flask-Login = "0.6.3"