Bump github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream from 1.7.1 to 1.7.8 in /tests/e2e-kubernetes

Bump github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream from 1.7.1 to 1.7.8 in /tests/e2e-kubernetes #2346