Bump Microsoft.AspNetCore.Mvc.Testing from 6.0.25 to 7.0.0

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 6.0.25 to 7.0.0.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.25...v7.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Mvc.Testing
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

DigitalLearningSolutions.Web.AutomatedUiTests/DigitalLearningSolutions.Web.AutomatedUiTests.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.25" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="Selenium.Axe" Version="4.0.21" />
     <PackageReference Include="Selenium.Support" Version="4.27.0" />

DigitalLearningSolutions.Web.IntegrationTests/DigitalLearningSolutions.Web.IntegrationTests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="FakeItEasy" Version="7.4.0" />
     <PackageReference Include="FluentAssertions.AspNetCore.Mvc" Version="3.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.25" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>