Support python 3.11

[AyanSinhaMahapatra]

Fixes #2730

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[pombredanne]

Here is a chat log with wonderful @SnoopJ on #python ! thank you

pombreda> Philippe Ombredanne Hiya, fierce pythonista ... why would this code fail only on Python 3.11 (and not any of 3.6 to 3.10) https://dev.azure.com/nexB/scancode-toolkit/_build/results?buildId=9632&view=logs&j=71924f90-629a-5f64-5467-4f9bed474c97&t=7cd9e9da-3c04-5bed-99f7-c0d42cb54f3b&l=641
11:10 PM https://github.com/nexB/scancode-toolkit/blob/support-py-311/src/packagedcode/models.py#L744
11:10 PM
Philippe Ombredanne did super() change in 3.11?

SnoopJ> snoopj pombreda, looks like something did change, some discussion here in attrs and a linked upstream issue: python-attrs/attrs#907
11:15 PM
Philippe Ombredanne SnoopJ: ah, this would in attrs! good catch!
11:15 PM
snoopj pombreda, it looks like this was fixed in attrs 22.1
11:15 PM
Philippe Ombredanne *you rock
11:16 PM
Philippe Ombredanne acresearch: pyenv is my friend for this ;)
11:16 PM
snoopj pombreda, it looks like spelling out the super() explicitly can work around the issue if you can't upgrade attrs. New bug to me :)

So the failures in https://dev.azure.com/nexB/44deaec8-15bb-470e-b20f-1e2c33a64c65/_apis/build/builds/9632/logs/142 on Python 3.11 is because of attrs-based classes:

2023-01-16T13:19:56.0426971Z >           assert result.exit_code == expected_rc, error
2023-01-16T13:19:56.0427278Z E           AssertionError: 
2023-01-16T13:19:56.0427518Z E             Failure to run:
2023-01-16T13:19:56.0427759Z E             rc: 1
2023-01-16T13:19:56.0428468Z E             scancode --package /home/vsts/work/1/s/tests/scancode/data/rpm/fping-2.4-0.b2.rhfc1.dag.i386.rpm --json /tmp/scancode-tk-tests -pyolaih8/v1olxgsg/td/tf.results.json --test-mode --verbose
2023-01-16T13:19:56.0429138Z E             output:
2023-01-16T13:19:56.0429403Z E              Setup plugin: scan:licenses...
2023-01-16T13:19:56.0429717Z E              Setup plugin: scan:packages...
2023-01-16T13:19:56.0430124Z E              Setup plugin: post_scan:license-references...
2023-01-16T13:19:56.0430481Z E              Setup plugin: output:json...
2023-01-16T13:19:56.0430784Z E             Collect file inventory...
2023-01-16T13:19:56.0431089Z E             Scan files for: packages with 1 process(es)...
2023-01-16T13:19:56.0431616Z E             Scanned: /home/vsts/work/1/s/tests/scancode/data/rpm/fping-2.4-0.b2.rhfc1.dag.i386.rpm
2023-01-16T13:19:56.0432211Z E             Scanned: /home/vsts/work/1/s/tests/scancode/data/rpm/fping-2.4-0.b2.rhfc1.dag.i386.rpm
2023-01-16T13:19:56.0432584Z E             Filter scans...
2023-01-16T13:19:56.0432842Z E              Filter scan: packages...
2023-01-16T13:19:56.0433171Z E             Run post-scans...
2023-01-16T13:19:56.0433533Z E              Run post-scan: license-references...
2023-01-16T13:19:56.0433823Z E             Save scan results...
2023-01-16T13:19:56.0434288Z E              Save scan results as: json...
2023-01-16T13:19:56.0434663Z E             Scanning done.
2023-01-16T13:19:56.0434942Z E             Some files failed to scan properly:
2023-01-16T13:19:56.0435367Z E             Path: fping-2.4-0.b2.rhfc1.dag.i386.rpm
2023-01-16T13:19:56.0435703Z E               ERROR: for scanner: packages:
2023-01-16T13:19:56.0435987Z E               ERROR: Unknown error:
2023-01-16T13:19:56.0436294Z E               Traceback (most recent call last):
2023-01-16T13:19:56.0436694Z E                 File "/home/vsts/work/1/s/src/scancode/interrupt.py", line 91, in interruptible
2023-01-16T13:19:56.0437110Z E                   return NO_ERROR, func(*(args or ()), **(kwargs or {}))
2023-01-16T13:19:56.0437438Z E                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2023-01-16T13:19:56.0437810Z E                 File "/home/vsts/work/1/s/src/scancode/api.py", line 308, in get_package_data
2023-01-16T13:19:56.0438244Z E                   return dict(package_data=[pd.to_dict() for pd in package_datas])
2023-01-16T13:19:56.0438600Z E                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2023-01-16T13:19:56.0439071Z E                 File "/home/vsts/work/1/s/src/scancode/api.py", line 308, in <listcomp>
2023-01-16T13:19:56.0439493Z E                   return dict(package_data=[pd.to_dict() for pd in package_datas])
2023-01-16T13:19:56.0440019Z E                                             ^^^^^^^^^^^^
2023-01-16T13:19:56.0440569Z E                 File "/home/vsts/work/1/s/src/packagedcode/models.py", line 744, in to_dict
2023-01-16T13:19:56.0441029Z E                   mapping = super().to_dict(with_details=with_details, **kwargs)
2023-01-16T13:19:56.0441386Z E                             ^^^^^^^
2023-01-16T13:19:56.0441757Z E               TypeError: super(type, obj): obj must be an instance or subtype of type

Here the super is a hierarchy of attrs objects.

The issue is python-attrs/attrs#907 and was fixed by @hynek in python-attrs/attrs#969 ... Thank you ++ @hynek ... you rock too!

The simple fix is to bump attrs to >= 22.1

[pombredanne]

All green and good looking. Thank you.