Missing NuGet packages for 3.7.0 release

[martincostello]

Describe the bug

Updating to version 3.7.0, package restore fails due to missing dependencies:

  Determining projects to restore...
/home/runner/work/alexa-london-travel/alexa-london-travel/test/LondonTravel.Skill.NativeAotTests/LondonTravel.Skill.NativeAotTests.csproj : error NU1603: Warning As Error: LondonTravel.Skill.NativeAotTests depends on MSTest.Engine (>= 1.0.0-alpha.24473.2) but MSTest.Engine 1.0.0-alpha.24473.2 was not found. MSTest.Engine 1.0.0-alpha.24503.4 was resolved instead.
/home/runner/work/alexa-london-travel/alexa-london-travel/test/LondonTravel.Skill.NativeAotTests/LondonTravel.Skill.NativeAotTests.csproj : error NU1603: Warning As Error: LondonTravel.Skill.NativeAotTests depends on MSTest.SourceGeneration (>= 1.0.0-alpha.24473.2) but MSTest.SourceGeneration 1.0.0-alpha.24473.2 was not found. MSTest.SourceGeneration 1.0.0-alpha.24503.4 was resolved instead.
  Restored /home/runner/work/alexa-london-travel/alexa-london-travel/src/LondonTravel.Skill/LondonTravel.Skill.csproj (in 1.96 sec).
  Failed to restore /home/runner/work/alexa-london-travel/alexa-london-travel/test/LondonTravel.Skill.NativeAotTests/LondonTravel.Skill.NativeAotTests.csproj (in 2.01 sec).

Steps To Reproduce

Update to MSTest.Sdk 3.7.0 in a project and run dotnet restore.

Expected behavior

Package restore succeeds.

Actual behavior

Package restore fails.