update to modern python format syntax

update to modern python format syntax

no logic change

scripts/spinner.py

@@ -17,10 +17,10 @@ class Spinner:
     def spin(self):
         """Spin the spinner"""
         while self.running:
-            sys.stdout.write(next(self.spinner) + " " + self.message + "\r")
+            sys.stdout.write(f"{next(self.spinner)} {self.message}\r")
             sys.stdout.flush()
             time.sleep(self.delay)
-            sys.stdout.write('\r' + ' ' * (len(self.message) + 2) + '\r')
+            sys.stdout.write(f"\r{' ' * (len(self.message) + 2)}\r")
 
     def __enter__(self):
         """Start the spinner"""
@@ -32,5 +32,5 @@ class Spinner:
         """Stop the spinner"""
         self.running = False
         self.spinner_thread.join()
-        sys.stdout.write('\r' + ' ' * (len(self.message) + 2) + '\r')
+        sys.stdout.write(f"\r{' ' * (len(self.message) + 2)}\r")
         sys.stdout.flush()