fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PYMYSQL-6968882

Author: snyk-bot

requirements.txt

@@ -9,7 +9,7 @@ flask_testing==0.8.1
 flask-socketio==5.3.5
 flask-moment==1.0.5
 flask-talisman==1.1.0
-pymysql==1.1.0
+pymysql==1.1.1
 pyjwt==2.8.0
 coverage==7.3.0
 https://github.com/benoitc/gunicorn/archive/refs/heads/master.zip#egg=gunicorn==20.1.0 # eventlet bug workaround