upgrade idna per dependabot security alert

Author: weddleben

requirements.txt

@@ -19,7 +19,7 @@ frozenlist==1.4.1
 greenlet==3.2.4
 gunicorn==23.0.0
 h11==0.16.0
-idna==3.11
+idna==3.15
 iniconfig==2.0.0
 itsdangerous==2.2.0
 Jinja2==3.1.6