⬆️ Bump FluentAssertions from 6.12.0 to 8.7.0

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.7.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

tests/SetlistStudio.Tests/SetlistStudio.Tests.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.8" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
     <PackageReference Include="Moq" Version="4.20.69" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.7.0" />
     <PackageReference Include="bunit" Version="1.24.10" />
     <PackageReference Include="Selenium.WebDriver" Version="4.15.0" />
     <PackageReference Include="Selenium.WebDriver.ChromeDriver" Version="119.0.6045.10500" />