Fix meson warning

'''
WARNING: Project targets '>=0.57.0' but uses feature introduced in
0.59.0': fs.stem_file.  meson.build:386:
'''

Warning is present on master, because we use features from 0.59, and
0.60.  Update to a minimu meson version of 0.63, to match both yocto and
  openbmc CI.

Tested:
meson build
no longer throws the above warning.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ifac119aa8c8e45859e7374e1c468ea0c91664c2d