Bump System.IO.Abstractions from 21.0.2 to 21.0.22 in /source

Bumps [System.IO.Abstractions](https://github.com/TestableIO/System.IO.Abstractions) from 21.0.2 to 21.0.22.
- [Release notes](https://github.com/TestableIO/System.IO.Abstractions/releases)
- [Commits](TestableIO/System.IO.Abstractions@v21.0.2...v21.0.22)

---
updated-dependencies:
- dependency-name: System.IO.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

source/Directory.Build.props

@@ -20,13 +20,13 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(MSBuildProjectName.EndsWith('er'))">
-    <PackageReference Include="MailKit" Version="4.3.0" />
-    <PackageReference Include="MimeKit" Version="4.3.0" />
+    <PackageReference Include="MailKit" Version="4.6.0" />
+    <PackageReference Include="MimeKit" Version="4.6.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
-    <PackageReference Include="System.IO.Abstractions" Version="21.0.2" />
+    <PackageReference Include="System.IO.Abstractions" Version="21.0.22" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(Configuration)' != 'Release' and $(MSBuildProjectName.EndsWith('er'))">