Update dependency System.Reactive to v6.0.1

Author: renovate[bot]

src/UnitTests/RxTelegram.Bot.UnitTests.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="nunit" Version="4.1.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-        <PackageReference Include="System.Reactive" Version="6.0.0" />
+        <PackageReference Include="System.Reactive" Version="6.0.1" />
     </ItemGroup>
 
     <ItemGroup>