OSS plugin hub entry for aws-request-signing is compatible with Konnect

## Jobs to be done (optional)
The page https://developer.konghq.com/plugins/aws-request-signing/ indicate that it is
Incompatible with
konnect

It is compatible with Konnect as a custom plugin.

## Definition of done
Correct incorrect information

## Information
I confirmed it's function via a konnect CP on a 3.15.0.2 DP.

## Due date (optional)

## Size
S

Start with the plugin page at https://developer.konghq.com/plugins/aws-request-signing/ and review its Konnect compatibility information. Confirm the reported compatibility with Konnect as a custom plugin, then correct the incompatible status; the issue is done when the page no longer presents that incorrect information.

Written by the indexing model from the issue text.