Update dependency JetBrains.Annotations to v2023 (#167)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Roslyn.Testing/Roslyn.Testing.csproj

@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="JetBrains.Annotations" Version="2022.3.1" />
+      <PackageReference Include="JetBrains.Annotations" Version="2023.2.0" />
       <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.1.0" />
       <PackageReference Include="Shouldly" Version="4.1.0" />
     </ItemGroup>

System.IO.Abstractions.Analyzers/System.IO.Abstractions.Analyzers.csproj

@@ -29,7 +29,7 @@
 	  <Optimize>false</Optimize>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="JetBrains.Annotations" Version="2022.3.1" PrivateAssets="all" />
+		<PackageReference Include="JetBrains.Annotations" Version="2023.2.0" PrivateAssets="all" />
 		<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
 		<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.1.0" PrivateAssets="all" />
 		<PackageReference Update="NETStandard.Library" PrivateAssets="all" />