Update dependency icalendar to v5.0.14

Author: renovate[bot]

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     'django-phonenumber-field[phonenumberslite]==7.3.0',
     'gunicorn==21.2.0',
     'holidays==0.40',
-    'icalendar==5.0.11',
+    'icalendar==5.0.14',
     'Pillow==10.4.0',
     'psycopg2-binary==2.9.10',
     'python-dateutil==2.8.2',