chore(deps): update dependency markdown to v3 [security]

Author: renovate[bot]

requirements.txt

@@ -6,7 +6,7 @@ Flask-GFM>=0.1.1, <0.2.0
 Flask-Markdown>=0.3, <0.4.0
 Flask-SQLAlchemy>=3.1.1, <3.2.0
 gunicorn>=22.0.0, <22.0.1
-Markdown>=2.6.11, <2.7.0
+Markdown>=3.10.2, <3.11.0
 psycopg2>=2.9.6, <2.10.0
 pytest>=6.2.1, <6.3.0
 Werkzeug>=3.0.1, <3.1.0