uqtk: bump

1. support version 3.1.3, which now depends on sundials@6

2. support version 3.1.2:, which broke the two patche files and
   therefore the two patch files have been replaced by more flexible
   filter_file() commands inside a patch() function.

3. rename variant for python extension from using the package name to
   the more standard "+python"

4. add maintainers @omsai and the upstream developer @bjdebus who
   offered to help with the spack packaging in
   sandialabs/UQTk#7 (comment)