Refitter: C# source injection through OpenAPI content-type map keys

Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.2, content-type keys in the content maps of requestBody/responses are emitted verbatim into a Refit [Headers("Accept: <ct>", "Content-Type: <ct>")] attribute string without escaping quotation marks. A crafted content-type key in an attacker-influenced OpenAPI description survives default validation without --skip-validation, breaks out of the attribute string and enclosing interface and namespace, and can introduce a top-level file class while leaving valid generated C#. A [ModuleInitializer] method in that class executes attacker code when the generated assembly is loaded at application startup, without requiring a call to the client. The behavior was verified with Refitter 2.0.0 and .NET 8. This issue is fixed in version 2.1.2.