chore: update changelog

fern/pages/changelogs/csharp-sdk/2024-11-25.mdx

@@ -0,0 +1,11 @@
+## 1.9.11
+**`(feat):`** Add two dependencies who previously were transitive dependencies to ensure the generated SDKs use the patched versions without vulnerabilities.
+- `System.Net.Http` >= `4.3.4`
+- `System.Text.RegularExpressions` >= `4.3.1`
+Update other dependencies to the latest version:
+- `Portable.System.DateTimeOnly` = `8.0.2` (on net462 & netstandard2.0)
+- `PolySharp` = `1.15.0`
+- `OneOf` = `3.0.271`
+- `OneOf.Extended` = `3.0.271`
+
+