[Fix] Update minimum python version to 3.7

[Ben-Louis]

Motivation

Support for python 3.6 has been deprecated in the latest MMEngine version (open-mmlab/mmengine#863), so we update the required minimum python version to 3.7 in MMPose.

Modification

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 80.31% // Head: 80.20% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (fa45cd2) compared to base (1941428).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1921      +/-   ##
===========================================
- Coverage    80.31%   80.20%   -0.12%     
===========================================
  Files          209      209              
  Lines        12449    12417      -32     
  Branches      2100     2100              
===========================================
- Hits          9999     9959      -40     
- Misses        2003     2009       +6     
- Partials       447      449       +2     

Flag	Coverage Δ
unittests	80.20% <ø> (-0.12%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/codecs/associative_embedding.py	92.50% <0.00%> (-3.75%)	⬇️
mmpose/models/pose_estimators/base.py	78.78% <0.00%> (-1.22%)	⬇️
mmpose/codecs/base.py	91.66% <0.00%> (-1.20%)	⬇️
mmpose/models/utils/regularizations.py	75.86% <0.00%> (-0.81%)	⬇️
mmpose/datasets/transforms/common_transforms.py	85.04% <0.00%> (-0.76%)	⬇️
mmpose/structures/pose_data_sample.py	97.05% <0.00%> (-0.67%)	⬇️
mmpose/apis/webcam/nodes/node.py	48.09% <0.00%> (-0.40%)	⬇️
mmpose/structures/multilevel_pixel_data.py	59.82% <0.00%> (-0.36%)	⬇️
mmpose/models/heads/base_head.py	83.87% <0.00%> (-0.26%)	⬇️
mmpose/datasets/transforms/bottomup_transforms.py	79.65% <0.00%> (-0.24%)	⬇️
... and 5 more

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