PDK update/convert ignore's .gitattribute file

I was reviewing a PR for apt when I noticed that it was for the .gitattributes file which, to my knowledge, should have been managed by the PDK.
Upon examining the file I noticed that it also contained the managed by ModuleSync message at the top of it that should have been automatically stripped out when we swapped over.
I then altered the .gitattribute file of my local copy of stdlib and ran PDK update to see what would happen only for my change to be ignored. I repeated my experiment with the PDK convert command and a local copy of apt.