Bump the kiota-dependencies group with 1 update

Bumps Microsoft.Kiota.Bundle from 1.20.1 to 1.21.1

---
updated-dependencies:
- dependency-name: Microsoft.Kiota.Bundle
  dependency-version: 1.21.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: kiota-dependencies
...

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

Author: dependabot[bot]

get-started/quickstart/dotnet/src/KiotaPosts.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Kiota.Bundle" Version="1.20.1" />
+    <PackageReference Include="Microsoft.Kiota.Bundle" Version="1.21.1" />
   </ItemGroup>
 
 </Project>