Fix package downgrade warning

Author: AArnott

Directory.Packages.props

@@ -15,7 +15,7 @@
     <PackageVersion Include="DNNE" Version="2.0.7" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="$(CodeAnalysisVersion)" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="$(CodeAnalysisAnalyzerVersion)" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="$(CodeAnalysisVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="$(CodeAnalysisVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing" Version="$(CodefixTestingVersion)" />