Add-on should import json directly, not from anki.utils

[IllDepence]

Problem description

When I run Anki in a dedicated Python virtual environment as follows

$ python3.9 -m venv anki_venv
$ source anki_venv/bin/activate
$ pip install --upgrade pip
$ pip install aqt
$ anki

Anki complains that json is imported from anki.utils and not directly:

[...]
  File "/home/[...]/.local/share/Anki2/addons21/review_heatmap/heatmap.py", line 37, in <module>
    from anki.utils import json
  File "/home/[...]/anki_venv/lib/python3.9/site-packages/anki/utils.py", line 41, in __getattr__
    traceback.print_stack(file=sys.stdout)
add-on should import json directly, not from anki.utils

This is the case in the following two places: https://github.com/glutanimate/review-heatmap/blob/master/src/review_heatmap/heatmap.py#L36 https://github.com/glutanimate/review-heatmap/blob/master/src/review_heatmap/libaddon/anki/configmanager.py#L42

Checklist

Please replace the space inside the brackets with an x if the following items apply:

• [x] I've restarted Anki to see if it helps
• [x] I've verified that I use the latest version of the add-on by redownloading it from AnkiWeb
• [x] I've verified that I use the latest version of Anki by checking at https://apps.ankiweb.net#download
• [x] I've tried to disable other add-ons to see if there are any interactions present
• [x] My issue disappears when I hold shift while starting Anki.
• [x] I've checked if anyone else reported this problem before by looking through the issue reports. I also checked to see if there is a section about known issues in the add-on description, documentation, or README.

Information about your Anki set-up

see above

Error message (if any)

see abve

[glutanimate]

Thanks for the report! This is now fixed in v1.0.0.