deleted itsdangerous from requirements as no needed (#1131)

Co-authored-by: Mykhailo Istomin <mykhailo.istomin@urbansdk.com>

Author: BrainIsDead

requirements.api.txt

@@ -2,7 +2,6 @@ delphi_utils==0.3.15
 epiweeks==2.1.2
 Flask==2.2.5
 Flask-Limiter==3.3.0
-itsdangerous<2.1
 jinja2==3.0.3
 more_itertools==8.4.0
 mysqlclient==2.1.1