GHSA-x6m9-38vm-2xhf: Scriban has an authorization bypass due to stale include cache surviving TemplateContext.Reset()

TemplateContext.Reset() claims that a TemplateContext can be reused safely on the same thread, but it does not clear CachedTemplates. If an application pools TemplateContext objects and uses an ITemplateLoader that resolves content per request, tenant, or user, a previously authorized include can be served to later renders without calling TemplateLoader.Load() again.