Bump github.com/aws/aws-sdk-go-v2/config from 1.18.27 to 1.26.1 in /extension/sigv4authextension

Bump github.com/aws/aws-sdk-go-v2/config from 1.18.27 to 1.26.1 in /extension/sigv4authextension #14948