Error parsing a HAR file: `decode` doesn't exist.

[tsilvs]

$> mitmproxy2swagger --input ~/Desktop/har.json --output ~/Desktop/spec.oapi --format har --api-prefix https://example.net/api/
[▉                             ] 3.2%Traceback (most recent call last):
  File "/usr/local/bin/mitmproxy2swagger", line 7, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/local/lib/python3.13/site-packages/mitmproxy2swagger/mitmproxy2swagger.py", line 265, in main
    body_val[key.decode("utf-8")] = value.decode("utf-8")
                                    ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'decode'. Did you mean: 'encode'?

[LuD1161]

Same issue here.