update yolox-pose ut

[huayuan4396]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
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 tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Patch coverage: 21.66% and project coverage change: -0.26 ⚠️

Comparison is base (a664f06) 49.86% compared to head (6fb44cc) 49.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2231      +/-   ##
==========================================
- Coverage   49.86%   49.61%   -0.26%     
==========================================
  Files         340      341       +1     
  Lines       13024    13134     +110     
  Branches     1910     1927      +17     
==========================================
+ Hits         6495     6517      +22     
- Misses       6073     6157      +84     
- Partials      456      460       +4     

Flag	Coverage Δ
unittests	49.61% <21.66%> (-0.26%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdeploy/mmcv/ops/nms.py	58.80% <0.00%> (-1.95%)	⬇️
...loy/codebase/mmpose/deploy/pose_detection_model.py	55.64% <12.12%> (-16.70%)	⬇️
...oy/codebase/mmpose/models/heads/yolox_pose_head.py	20.63% <20.63%> (ø)
mmdeploy/codebase/mmpose/deploy/pose_detection.py	72.67% <66.66%> (+0.10%)	⬆️
mmdeploy/codebase/mmpose/models/heads/__init__.py	100.00% <100.00%> (ø)
mmdeploy/utils/constants.py	96.29% <100.00%> (+0.06%)	⬆️

... and 1 file with indirect coverage changes

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[RunningLeon]

LGTM