Ensure unstable UUID functions are behind a build flag

lib/src/fnc/rand.rs

@@ -134,6 +134,7 @@ pub mod uuid {
 		Ok(Uuid::new_v4().into())
 	}
 
+	#[cfg(uuid_unstable)]
 	pub fn v7(_: ()) -> Result<Value, Error> {
 		Ok(Uuid::new_v7().into())
 	}

lib/src/sql/uuid.rs

@@ -51,6 +51,7 @@ impl Uuid {
 		Self(uuid::Uuid::new_v4())
 	}
 	/// Generate a new V7 UUID
+	#[cfg(uuid_unstable)]
 	pub fn new_v7() -> Self {
 		Self(uuid::Uuid::now_v7())
 	}