use f string instead of "format" (#1724)

Co-authored-by: Holly Sweeney <77758406+holly1238@users.noreply.github.com>

Author: Polydynamical

beginner_source/basics/quickstart_tutorial.py

@@ -89,7 +89,7 @@
 
 # Get cpu or gpu device for training.
 device = "cuda" if torch.cuda.is_available() else "cpu"
-print("Using {} device".format(device))
+print(f"Using {device} device")
 
 # Define model
 class NeuralNetwork(nn.Module):