cameractrlsgtk*.py is missing a python dependency

Description:

The package provides the following shell commands:

• cameractrls
• cameractrlsgtk.py
• cameractrlsgtk4.py

The two GTK related cannot be used due to a missing python package gi:

Traceback (most recent call last):
  File "/usr/sbin/cameractrlsgtk4.py", line 4, in <module>
    import gi
ModuleNotFoundError: No module named 'gi'

Additional info:

• package version(s): 0.5.13-1
• config and/or log files: N/A -- mentioned in the description
• link to upstream bug report, if any: N/A

Steps to reproduce:

1. install the package pacman -S cameractrls
2. run a GTK related command, e.g. cameractrlsgtk.py