Bump botocore dependency specification

[jakob-keller]

Description of Change

This PR intends to improve general compatibility of aiobotocore within the Python ecosystem by bumping the dependency specification of botocore, as well as boto3 and awscli.

Assumptions

Upstream diff contains minor changes that require adjustments to the aiobotocore codebase.

Checklist for All Submissions

• I have added change info to CHANGES.rst
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details):
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.00%. Comparing base (53d9c09) to head (8a50b61).
Report is 25 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1202   +/-   ##
=======================================
  Coverage   86.99%   87.00%           
=======================================
  Files          64       64           
  Lines        5983     5986    +3     
=======================================
+ Hits         5205     5208    +3     
  Misses        778      778           

Flag	Coverage Δ
unittests	87.00% <100.00%> (+<0.01%)	⬆️

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