Bug#1032024: amd64-microcode: Use non-native package format

[Bastian Germann]

Source: amd64-microcode
Version: 3.20220411.2

amd64-microcode uses source format 3.0 (native) even though it has an upstream.
It should use 3.0 (quilt) instead, using "-" instead of "." to separate the 
Debian revision.