vcontainer integration requires langVersion

[slimshader]

Docs only mention langVersion setting as a tip for {init;} props so not sure if this is by design or not but when using VContainer integration results in multiple errors (Unity 2022.3.16):

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS8773	Feature 'file-scoped namespace' is not available in C# 9.0. Please use language version 10.0 or greater.	VitalRouter	[...]\Library\PackageCache\jp.hadashikick.vitalrouter@f0088d8968\Runtime\AnonymousInterceptor.cs	5	Active