[UPDATE] Update ical requirement from <11,>=10.0.3 to >=10.0.3,<12

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/10.0.3...11.0.0)

---
updated-dependencies:
- dependency-name: ical
  dependency-version: 11.0.0
  dependency-type: direct:production
...

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

core/static/core/footer.scss

@@ -2,6 +2,10 @@
 @import "devices";
 
 footer.bottom-links {
+  >section>a {
+    text-align: center;
+  }
+
   @media (max-width: $small-devices) {
     margin-top: 0.6em;
     padding: 1.25em;

pyproject.toml

@@ -43,7 +43,7 @@ dependencies = [
     "tomli<3.0.0,>=2.2.1",
     "django-honeypot>=1.3.0,<2",
     "pydantic-extra-types<3.0.0,>=2.10.3",
-    "ical>=10.0.3,<11",
+    "ical>=10.0.3,<12",
     "redis[hiredis]<6.0.0,>=5.3.0",
     "environs[django]<15.0.0,>=14.1.1",
     "requests>=2.32.3",