Bump System.IO.Abstractions from 21.0.26 to 21.0.29

Bumps [System.IO.Abstractions](https://github.com/TestableIO/System.IO.Abstractions) from 21.0.26 to 21.0.29.
- [Release notes](https://github.com/TestableIO/System.IO.Abstractions/releases)
- [Commits](TestableIO/System.IO.Abstractions@v21.0.26...v21.0.29)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/LibYear.Core/LibYear.Core.csproj

@@ -21,6 +21,6 @@
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
 		<PackageReference Include="NuGet.Protocol" Version="6.10.1" />
 		<None Include="../../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="." />
-		<PackageReference Include="System.IO.Abstractions" Version="21.0.26" />
+		<PackageReference Include="System.IO.Abstractions" Version="21.0.29" />
 	</ItemGroup>
 </Project>

test/LibYear.Core.Tests/LibYear.Core.Tests.csproj

@@ -9,7 +9,7 @@
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
 		<PackageReference Include="NSubstitute" Version="5.1.0" />
 		<PackageReference Include="NuGet.Protocol" Version="6.10.1" />
-		<PackageReference Include="System.IO.Abstractions" Version="21.0.26" />
+		<PackageReference Include="System.IO.Abstractions" Version="21.0.29" />
 		<PackageReference Include="xunit" Version="2.9.0" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
 		<ProjectReference Include="../../src/LibYear.Core/LibYear.Core.csproj" />