[UPDATE] Update ical requirement from <12,>=11.1.0 to >=11.1.0,<13

Updates the requirements on [ical](https://github.com/allenporter/ical) to permit the latest version.
- [Release notes](https://github.com/allenporter/ical/releases)
- [Commits](https://github.com/allenporter/ical/compare/11.1.0...12.0.0)

---
updated-dependencies:
- dependency-name: ical
  dependency-version: 12.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -43,7 +43,7 @@ dependencies = [
     "tomli>=2.3.0,<3.0.0",
     "django-honeypot>=1.3.0,<2",
     "pydantic-extra-types>=2.10.6,<3.0.0",
-    "ical>=11.1.0,<12",
+    "ical>=11.1.0,<13",
     "redis[hiredis]<7,>=5.3.0",
     "environs[django]>=14.5.0,<15.0.0",
     "requests>=2.32.5,<3.0.0",