[Enhancement] MMCV maximum_version set to 1.7

[Zachary-66]

Modification

1. mmflow/__init__.py
2. requirements/mminstall.txt

ref: open-mmlab/mmsegmentation#1764

[codecov]

Codecov Report

Merging #167 (3d68a86) into master (cf1c2f2) will decrease coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   69.03%   68.80%   -0.24%     
==========================================
  Files          92       92              
  Lines        5148     5148              
  Branches      733      733              
==========================================
- Hits         3554     3542      -12     
- Misses       1481     1491      +10     
- Partials      113      115       +2     

Flag	Coverage Δ
unittests	68.80% <100.00%> (-0.20%)	⬇️

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Impacted Files	Coverage Δ
mmflow/__init__.py	70.58% <100.00%> (ø)
mmflow/utils/misc.py	95.23% <0.00%> (-4.77%)	⬇️
mmflow/datasets/pipelines/transforms.py	79.33% <0.00%> (-1.84%)	⬇️
mmflow/datasets/dataset_wrappers.py	43.75% <0.00%> (ø)

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