opentelemetry-instrumentation-botocore: loosen aiobotocore version constraints to allow for 3.x (#4601)

* opentelemetry-instrumentation-botocore: loosen aiobotocore version constraints to allow for 3.x

* add changelog fragment

* fix README.md formatting

* fix spacing

* Apply suggestion from @xrmx

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Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>