Convert format strings strings to f-strings (#23241)

* Convert all text strings to f-strings

Reformats all the text from the old "%-formatted" and .format(...) format to the newer f-string format, as defined in PEP 498. This requires Python 3.6+.

Flynt 0.69 was used to reformat the strings. 120 f-strings were created in 51 files.

F-strings are in general more readable, concise and performant. See also: https://www.python.org/dev/peps/pep-0498/#rationale

* revert pyextra changes

* revert ublox.py

Co-authored-by: Willem Melching <willem.melching@gmail.com>
old-commit-hash: 55390d273f36f49da3896e687ac5530f40c1d150

common/timeout.py

@@ -12,7 +12,7 @@ class Timeout:
   """
   def __init__(self, seconds, error_msg=None):
     if error_msg is None:
-      error_msg = 'Timed out after {} seconds'.format(seconds)
+      error_msg = f'Timed out after {seconds} seconds'
     self.seconds = seconds
     self.error_msg = error_msg