[Fix] Update mmcv_maximum_version

[shun001]

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Motivation

Update mmcv_maximum_version.

Modification

Update mmcv_maximum_version to 2.3.0.

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.

[yncxcw]

Hello, I am also running this issue, can we get this change merged soon.

[shun001]

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