Update JetBrains.Annotations

It uses [Conditional] again after 2025.2.2

src/Directory.Build.props

@@ -45,8 +45,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <!-- Do not update beyond 2024.3.0, later versions do not use [Conditional] anymore -->
-    <PackageReference Include="JetBrains.Annotations" Version="[2024.3.0]" PrivateAssets="all" />
+    <PackageReference Include="JetBrains.Annotations" Version="2025.2.2" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>