chore(deps): update dependency basic.reference.assemblies.net90 to 1.8.7

Author: renovate[bot]

src/Directory.Packages.props

@@ -18,7 +18,7 @@
 
     <!-- Test Infrastructure -->
     <PackageVersion Include="Basic.Reference.Assemblies.Net100" Version="1.8.4" />
-    <PackageVersion Include="Basic.Reference.Assemblies.Net90" Version="1.8.4" />
+    <PackageVersion Include="Basic.Reference.Assemblies.Net90" Version="1.8.7" />
     <PackageVersion Include="Basic.Reference.Assemblies.Net80" Version="1.8.4" />
 
     <!-- Dependencies -->