Inventory plugin: drop `api_token` in favor of `oauth_token`

[mamercad]

SUMMARY

Fixes #300; drop api_token in favor of oauth_token.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

• digitalocean inventory plugin

ADDITIONAL INFORMATION

N/A

[codecov[bot]]

Codecov Report

Merging #301 (e5a320b) into main (d4ba6a5) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #301      +/-   ##
==========================================
- Coverage   31.10%   31.08%   -0.02%     
==========================================
  Files          45       45              
  Lines        3588     3587       -1     
  Branches      732      732              
==========================================
- Hits         1116     1115       -1     
  Misses       2452     2452              
  Partials       20       20              

Flag	Coverage Δ
sanity	26.40% <0.00%> (-0.03%)	:arrow_down:
units	64.49% <100.00%> (-0.09%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
plugins/inventory/digitalocean.py	70.83% <100.00%> (-0.31%)	:arrow_down: