Bump FsCheck.Xunit from 2.16.6 to 3.4.0

---
updated-dependencies:
- dependency-name: FsCheck.Xunit
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

tests/CodeIndex.Tests/CodeIndex.Tests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.0" />
-    <PackageReference Include="FsCheck.Xunit" Version="2.16.6" />
+    <PackageReference Include="FsCheck.Xunit" Version="3.4.0" />
     <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.9" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="3.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />