Bug#1023971: pantalaimon: Missing dependency on python3-pydbus and python3-notify2

[Val Lorentz <progval@progval.net>]

retitle 1023971 pantalaimon: Should depend on (rather than recommend) 
python3-pydbus and python3-notify2

I also just noticed notify2 is required by the main executable:

$ pantalaimon --log-level debug
Traceback (most recent call last):
  File "/usr/bin/pantalaimon", line 33, in <module>
    sys.exit(load_entry_point('pantalaimon==0.9.1', 'console_scripts', 
'pantalaimon')())
  File "/usr/bin/pantalaimon", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.9/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.9/importlib/__init__.py", line 127, in 
import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in 
_find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in 
_call_with_frames_removed
  File "/usr/lib/python3/dist-packages/pantalaimon/main.py", line 33, 
in <module>
    from pantalaimon.ui import UI_ENABLED
  File "/usr/lib/python3/dist-packages/pantalaimon/ui.py", line 29, in 
<module>
    import notify2
ModuleNotFoundError: No module named 'notify2'

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