Pin dependencies in Statiq.CodeAnalysis.csproj to resolve security issues.

Author: jasonsummers

src/extensions/Statiq.CodeAnalysis/Statiq.CodeAnalysis.csproj

@@ -6,6 +6,9 @@
   <ItemGroup>
     <PackageReference Include="Buildalyzer.Workspaces" Version="8.0.0" />
     <PackageReference Include="System.Linq.Async" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Build" Version="18.0.2" />
+    <PackageReference Include="Microsoft.Build.Tasks.Core" Version="18.0.2" />
+    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="18.0.2" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\core\Statiq.Common\Statiq.Common.csproj" />