Loosen aiohttp requirement

[tkdrob]

Pull request summary

The application I am currently using requires aiohttp 3.8.1. All seems to be working good with 3.8.1. Perhaps dependabot should be implemented.

Checklist

• [x] If code changes were made then they have been tested.
  • [ ] I have updated the documentation to reflect the changes.
  • [x] I have updated the changelog with a quick recap of my changes.
• [x] This PR fixes an issue.
• [ ] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)