majak: Update requirements

requirements/base.txt

@@ -48,7 +48,7 @@ six==1.15.0               # via html5lib, ics, l18n, mozilla-django-oidc, pyopen
 soupsieve==2.2.1          # via beautifulsoup4
 sqlparse==0.4.1           # via django
 tablib[xls,xlsx]==3.0.0   # via wagtail
-tatsu==5.6.0              # via ics
+tatsu==5.6.1              # via ics
 urllib3==1.26.4           # via requests, sentry-sdk
 wagtail-metadata==3.4.0   # via -r base.in
 wagtail==2.12.3           # via -r base.in, wagtail-metadata