chore(main): release 1.21.0 (#582)

Co-authored-by: release-please-token-provider[bot] <225477224+release-please-token-provider[bot]@users.noreply.github.com>

Author: release-please-token-provider[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.20.1"
+  ".": "1.21.0"
 }

CHANGELOG.md

@@ -5,6 +5,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.21.0](https://github.com/microsoft/kiota-dotnet/compare/v1.20.1...v1.21.0) (2025-10-28)
+
+
+### Features
+
+* Add SetContentFromEnumCollection method to RequestInformation class ([d970e8e](https://github.com/microsoft/kiota-dotnet/commit/d970e8edcf4c18b906d8754537eb6b8583c227e1))
+
+
+### Bug Fixes
+
+* Restore constructor backwards compatibility on old .NET versions. ([ce59749](https://github.com/microsoft/kiota-dotnet/commit/ce5974988f6636accc48388358c43825f2703339))
+* Restore constructor compatibility consuming a downlevel library on .NET 5+. ([36c543e](https://github.com/microsoft/kiota-dotnet/commit/36c543ed1c44daea781fd4c969d8c38a2301f173))
+* Restore HttpClientRequestAdapter constructor compatibility between .NET 5+ and .NET Standard/Framework ([08edbad](https://github.com/microsoft/kiota-dotnet/commit/08edbada7f1747f50df334654a71ef77cbdf02e4))
+
 ## [1.20.1](https://github.com/microsoft/kiota-dotnet/compare/v1.20.0...v1.20.1) (2025-09-26)
 
 

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <!-- Common default project properties for ALL projects-->
   <PropertyGroup>
-    <VersionPrefix>1.20.1</VersionPrefix>
+    <VersionPrefix>1.21.0</VersionPrefix>
     <VersionSuffix/>
     <!-- This is overidden in test projects by setting to true-->
     <IsTestProject>false</IsTestProject>