Bump Verify.MSTest from 20.1.0 to 20.1.1 in /src (#900)

Author: dependabot[bot]

src/NugetUsage/MSTestNugetUsage/MSTestNugetUsage.csproj

@@ -8,7 +8,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.0.2" />
     <PackageReference Include="MSTest.TestFramework" Version="3.0.3" />
-    <PackageReference Include="Verify.MSTest" Version="20.1.0" />
+    <PackageReference Include="Verify.MSTest" Version="20.1.1" />
     <!-- end-snippet -->
   </ItemGroup>
 </Project>