fix(aws-lambda) change path from request_uri to upstream_uri

[oowl]

Summary

when aws-lambda plugin awsgateway_compatible configuration set to true and request-transformer replace uri configuration enabled, kong use request_uri to find serializer path args, this action doesn't respect request-transformer configuration parameters

Full changelog

change aws-lambda plugin serializer path arg from request_uri to upstream_uri

Issue reference

Fix #8608

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