Bump AutoFixture from 4.17.0 to 4.18.1

Bumps [AutoFixture](https://github.com/AutoFixture/AutoFixture) from 4.17.0 to 4.18.1.
- [Release notes](https://github.com/AutoFixture/AutoFixture/releases)
- [Commits](AutoFixture/AutoFixture@v4.17.0...v4.18.1)

---
updated-dependencies:
- dependency-name: AutoFixture
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ReportAPI/LearningHub.Nhs.ReportApi.Services.UnitTests/LearningHub.Nhs.ReportApi.Services.UnitTests.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AutoFixture" Version="4.17.0" />
+    <PackageReference Include="AutoFixture" Version="4.18.1" />
     <PackageReference Include="LearningHub.Nhs.Models" Version="2.1.12" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />

WebAPI/LearningHub.Nhs.Services.UnitTests/LearningHub.Nhs.Services.UnitTests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AutoFixture" Version="4.17.0" />
+    <PackageReference Include="AutoFixture" Version="4.18.1" />
     <PackageReference Include="elfhHub.Nhs.Models" Version="3.0.8" />
     <PackageReference Include="EntityFrameworkCore.Testing.Moq" Version="4.0.0" />
     <PackageReference Include="FluentAssertions" Version="8.0.1" />