Update dependency System.IO.Abstractions to v12.2.6 (#72)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

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

@@ -8,7 +8,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
-		<PackageReference Include="System.IO.Abstractions" Version="12.2.2" />
+		<PackageReference Include="System.IO.Abstractions" Version="12.2.6" />
 		<PackageReference Include="xunit" Version="2.4.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
 	</ItemGroup>