completely NON ctitical in this application. Almost any small cap will work OK and generally with values between .01 and .1 will make no difference although .047 is a very common value so it will be easy to find in many different styles of cap.
I prefer the "MKT" type myself as they are regular in size and so they look neat on a finished board. Axial types like this are a bit harder to find these days. For the Bally MPU project I had to have a small run done in the capacitor factory of the common values used on the board as they were not available 'off the shelf'.
