chore(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
aiohttp	dev	pin	>= 3.3.0, < 4.0.0 -> 3.9.1
pytest (source, changelog)	dev	pin	>= 4.0.0, < 8.0.0 -> 7.4.3
pytest-asyncio (changelog)	dev	pin	>= 0.16.0, < 0.22.0 -> 0.21.1
pytest-mock (changelog)	dev	pin	>= 2.0.0, < 4.0.0 -> 3.12.0

Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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