Update dependency Microsoft.CodeAnalysis.CSharp to v4.5.0

Author: renovate[bot]

Tools/Schema.NET.Tool/Schema.NET.Tool.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup Label="Package References">
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" />
   </ItemGroup>
 
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