Do not auto-upgrade auto-cpufreq when installed via package manager

[xeruf]

Erroneous Behavior

After adding auto-cpufreq in #793 I get

── 14:30:35 - auto-cpufreq ─────────────────────────────────────────────────────                                                                                                 14:30:47 [102/1226]
Traceback (most recent call last):                                                                
  File "/usr/bin/auto-cpufreq", line 5, in <module>                                                                                                                                                 
    from auto_cpufreq.bin.auto_cpufreq import main                                                
ModuleNotFoundError: No module named 'auto_cpufreq'                                                                                                                                                 

because I have installed it from the AUR

Expected Behavior

Only auto-upgrade it when installed via python (I guesss?)

Steps to reproduce

Install from AUR on Arch