v4r1: Added IO 9&10, made board a factor of 2.54mm; KiCad 6 update

Updates:

• Board has now two more pins to also provide access to IO 9&10 which can be used in certain scenarios!
• The outer pins are now also spaced in a factor of 2.54mm to make the board fit perfectly on a breadboard!
• KiCad files have been converted to version 6