➖ Drop support for python 3.7 (#391)

[Galileo-Galilei]

Description

Prepare #391

Development notes

What have you changed, and how has this been tested?

Checklist

• Read the contributing guidelines
• Open this PR as a 'Draft Pull Request' if it is work-in-progress
• Update the documentation to reflect the code changes
• Add a description of this change and add your name to the list of supporting contributions in the CHANGELOG.md file. Please respect Keep a Changelog guidelines.
• Add tests to cover your changes

Notice

• I acknowledge and agree that, by checking this box and clicking "Submit Pull Request":

• I submit this contribution under the Apache 2.0 license and represent that I am entitled to do so on behalf of myself, my employer, or relevant third parties, as applicable.

• I certify that (a) this contribution is my original creation and / or (b) to the extent it is not my original creation, I am authorised to submit this contribution on behalf of the original creator(s) or their licensees.

• I certify that the use of this contribution as authorised by the Apache 2.0 license does not violate the intellectual property rights of anyone else.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.11 ⚠️

Comparison is base (d0a80d3) 100.00% compared to head (c269c47) 99.89%.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #434      +/-   ##
===========================================
- Coverage   100.00%   99.89%   -0.11%     
===========================================
  Files           28       28              
  Lines          962      982      +20     
===========================================
+ Hits           962      981      +19     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
kedro_mlflow/framework/hooks/mlflow_hook.py	100.00% <100.00%> (ø)

... and 9 files with indirect coverage changes

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