Bump version to 1.4

[ZwwWayne]

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Motivation

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

Modification

Bump version to 1.4

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.

[codecov]

Codecov Report

Attention: 167 lines in your changes are missing coverage. Please review.

Comparison is base (5c0613b) 46.70% compared to head (0ef13b8) 47.26%.

Files	Patch %	Lines
mmdet3d/evaluation/metrics/waymo_metric.py	9.52%	76 Missing ⚠️
...tion/functional/waymo_utils/prediction_to_waymo.py	0.00%	34 Missing ⚠️
mmdet3d/datasets/waymo_dataset.py	30.43%	27 Missing and 5 partials ⚠️
mmdet3d/models/detectors/multiview_dfm.py	29.03%	22 Missing ⚠️
mmdet3d/engine/hooks/visualization_hook.py	0.00%	0 Missing and 2 partials ⚠️
mmdet3d/models/detectors/dfm.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2867      +/-   ##
==========================================
+ Coverage   46.70%   47.26%   +0.55%     
==========================================
  Files         277      277              
  Lines       23635    23415     -220     
  Branches     3704     3655      -49     
==========================================
+ Hits        11039    11067      +28     
+ Misses      11892    11635     -257     
- Partials      704      713       +9     

Flag	Coverage Δ
unittests	47.26% <19.71%> (+0.55%)	⬆️

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