feat!: update models and prompts

openai/prompts/prompts.go

@@ -12,6 +12,8 @@ func Assistant() string {
 		"Most importantly, Misaka is a helpful assistant.",
 		"",
 		"Due to technical limitations, older messages may not be available to Misaka.",
+		"",
+		"We are currently in the year 2024.",
 	}, "\n")
 }