chore(deps): update dependency markdown to v3.8.1 [security]

Author: renovate[bot]

requirements.txt

@@ -11,7 +11,7 @@ Flask-WTF==1.2.2
 google-api-python-client==2.161.0
 google-auth-httplib2==0.2.0
 google-auth-oauthlib==1.2.1
-Markdown==3.7
+Markdown==3.8.1
 pytest==8.3.4
 pytest-cov==6.0.0
 pytest-flask==1.3.0