Downgrade SSS to 1.2.0-beta.8

Author: Jamil Maqdis Anton

tests/SqlStreamStore.FSharp.Tests.fsproj

@@ -15,7 +15,7 @@
 
     <ItemGroup>
         <PackageReference Include="Expecto" Version="9.*" />
-        <PackageReference Include="SqlStreamStore" Version="1.2.1-alpha.3" />
+        <PackageReference Include="SqlStreamStore" Version="1.2.0-beta.8" />
         <PackageReference Include="YoloDev.Expecto.TestSdk" Version="0.*" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.*" />
         <PackageReference Update="FSharp.Core" Version="4.*" />