change the qrcode of qq_group

[1940653868]

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Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

MMlab qq group 2 is full, we need to replace it with group3's qrcode.

Modification

Replace the qrcode.

BC-breaking (Optional)

Does the modification introduce changes that break the back-compatibility of the downstream repos? If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.26%. Comparing base (eb5a5a2) to head (4c9b04f). Report is 52 commits behind head on 1.0.

Additional details and impacted files

@@           Coverage Diff           @@
##              1.0    #1620   +/-   ##
=======================================
  Coverage   50.26%   50.26%           
=======================================
  Files         223      223           
  Lines       19182    19182           
  Branches     3153     3153           
=======================================
  Hits         9642     9642           
  Misses       8959     8959           
  Partials      581      581           

Flag	Coverage Δ
unittests	50.26% <ø> (ø)

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[ZwwWayne]

Please follow this PR https://github.com/open-mmlab/mmdetection/pull/8370 to delete the original image and use the image link

[OpenMMLab-Assistant-004]

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