Bump Microsoft.NET.Test.Sdk from 18.7.0 to 18.8.1

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

WoofWare.Myriad.Plugins.Attributes/Test/WoofWare.Myriad.Plugins.Attributes.Test.fsproj

@@ -18,7 +18,7 @@
 
     <ItemGroup>
         <PackageReference Include="ApiSurface" Version="5.0.7" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1"/>
         <PackageReference Include="NUnit" Version="4.5.0"/>
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0"/>
     </ItemGroup>

WoofWare.Myriad.Plugins.Test/WoofWare.Myriad.Plugins.Test.fsproj

@@ -73,7 +73,7 @@
     <PackageReference Include="ApiSurface" Version="5.0.7" />
     <PackageReference Include="FsCheck" Version="3.3.3" />
     <PackageReference Include="FsUnit" Version="7.1.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageReference Include="NUnit" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
     <PackageReference Include="WoofWare.Expect" Version="0.8.6" />

WoofWare.Myriad.Plugins/Test/WoofWare.Myriad.Plugins.GeneratorTest.fsproj

@@ -21,7 +21,7 @@
 
     <ItemGroup>
         <PackageReference Include="FsUnit" Version="7.1.1" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1"/>
         <PackageReference Include="NUnit" Version="4.5.0"/>
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0"/>
     </ItemGroup>