chore(deps): bump MSTest.TestAdapter from 3.7.2 to 3.7.3 (#620)

Author: dependabot[bot]

Directory.Packages.props

@@ -20,7 +20,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="17.13.1" />
     <PackageVersion Include="Microsoft.TestPlatform.TestHost" Version="17.12.0" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="3.7.2" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.7.3" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.7.2" />
     <PackageVersion Include="NUnit" Version="4.3.2" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />