Bump System.IO.Abstractions from 4.2.4 to 4.2.17 (#283)

Bumps [System.IO.Abstractions](https://github.com/System-IO-Abstractions/System.IO.Abstractions) from 4.2.4 to 4.2.17.
- [Release notes](https://github.com/System-IO-Abstractions/System.IO.Abstractions/releases)
- [Commits](TestableIO/System.IO.Abstractions@v4.2.4...v4.2.17)

Author: dependabot-preview[bot]

Fritz.StreamTools/Fritz.StreamTools.csproj

@@ -27,7 +27,7 @@
 		<PackageReference Include="Microsoft.Azure.CognitiveServices.Language.TextAnalytics" Version="2.8.0-preview" />
 		<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.6" />
 		<PackageReference Include="Octokit" Version="0.32.0" />
-		<PackageReference Include="System.IO.Abstractions" Version="4.2.4" />
+		<PackageReference Include="System.IO.Abstractions" Version="4.2.17" />
 		<PackageReference Include="System.Memory" Version="4.5.3" />
 	</ItemGroup>
 	<ItemGroup>

Test/Test.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="FluentAssertions" Version="5.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.1" />
     <PackageReference Include="Moq" Version="4.11.0" />
-    <PackageReference Include="System.IO.Abstractions" Version="4.2.4" />
+    <PackageReference Include="System.IO.Abstractions" Version="4.2.17" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
       <PrivateAssets>all</PrivateAssets>