Bump prometheus-net from 3.6.0 to 4.0.0

Bumps [prometheus-net](https://github.com/prometheus-net/prometheus-net) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/prometheus-net/prometheus-net/releases)
- [Changelog](https://github.com/prometheus-net/prometheus-net/blob/master/History)
- [Commits](https://github.com/prometheus-net/prometheus-net/compare/v3.6.0...v4.0.0)

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

Jellyfin.Server/Jellyfin.Server.csproj

@@ -42,7 +42,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.9" />
     <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks" Version="3.1.9" />
     <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="3.1.9" />
-    <PackageReference Include="prometheus-net" Version="3.6.0" />
+    <PackageReference Include="prometheus-net" Version="4.0.0" />
     <PackageReference Include="prometheus-net.AspNetCore" Version="3.6.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="3.4.0" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="3.1.0" />