Update mach to work with python 3.12

After updating to python 3.12, mach no longer worked:

AttributeError: 'RawConfigParser' object has no attribute 'readfp'. Did you mean: 'read'?

We can pull in the patch from bugzilla 1858056, which was not backported to esr 115.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information