Relax botocore dependency specification

[jakob-keller]

Description of Change

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

CHANGES.rst is updated in preparation for a release.

Assumptions

Upstream contains no 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
• I have added URL to diff: https://github.com/boto/botocore/compare/1.37.24..1.37.27

[jakob-keller]

A further version bump is prepared, but currently lacks test coverage. I will follow up, but would like to go ahead and ship this ASAP to address user needs.