Hangfire.InMemory cannot be installed in .NET 10 project with NuGet security audit enabled

**Environment**

- .NET SDK: 10.0.101
- Hangfire.InMemory: 1.0.0
- NuGet: Central Package Management enabled (`Directory.Packages.props`)
- IDE: JetBrains Rider 2024.3 (but the issue reproduces via `dotnet restore`)

**Steps to reproduce**

1. Create a .NET 10 solution that uses Central Package Management:
```xml



true





```
2. Add `` to a project (e.g., Infrastructure.csproj).
3. Run `dotnet restore` (NuGet security auditing is on by default in the .NET 10 SDK).

**Actual result**

Restore fails with:

```
Warning As Error: Package 'Newtonsoft.Json' 11.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
NuGet.PackageManagement.PackageReferenceRollbackException: Package restore failed. Rolling back package changes for 'Infrastructure'.
```

Hangfire.InMemory depends on `Hangfire.Core 1.3.4`, which in turn pulls `Newtonsoft.Json 11.0.1`. Because NuGet security audit treats this as a high severity vulnerability, restore is blocked.

**Expected result**

Hangfire.InMemory should depend on a version of `Newtonsoft.Json` without known vulnerabilities so that .NET 10 projects with auditing enabled can install it.

**Additional notes**

- The package currently only targets .NET Framework TFMs (`net461`-`net481`). A `netstandard` or `net6.0`/`net7.0` build would eliminate the need to carry legacy dependencies and would allow the package to run in modern ASP.NET Core applications without compatibility warnings.
- Until the package updates its dependency graph, anyone using default .NET 10 tooling cannot install Hangfire.InMemory.