chore(deps): update dependency pytest to v9 [security]

Author: renovate[bot]

requirements.txt

@@ -8,6 +8,6 @@ Flask-SQLAlchemy>=3.1.1, <3.2.0
 gunicorn>=22.0.0, <22.0.1
 Markdown>=2.6.11, <2.7.0
 psycopg2>=2.9.6, <2.10.0
-pytest>=6.2.1, <6.3.0
+pytest>=9.0.3, <9.1.0
 Werkzeug>=3.0.1, <3.1.0
 coverage<8