runtime(progress): Update maintainer info

runtime(progress): Update maintainer info

The Progress syntax file was last updated eight years ago, and the header
information twelve years ago. Attempts to contact the last known maintainer at
the email address listed in the file header (with the spam-prevention characters
removed) produced a delivery failure notification stating that the address did
not exist.

I intend to submit some minor improvements to this file. Per [1], I will assume
maintainership of it for the time being.

related: #15339

Signed-off-by: Daniel Smith <daniel@rdnlsmith.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
[1]: https://groups.google.com/g/vim_dev/c/I3pOKIOgM4A/m/pekGQB_lBwAJ