Bump github.com/aws/aws-sdk-go-v2/service/sts from 1.19.2 to 1.26.5 in /extension/sigv4authextension

Bump github.com/aws/aws-sdk-go-v2/service/sts from 1.19.2 to 1.26.5 in /extension/sigv4authextension #24944