Update github.com/prometheus/client_golang to v1.20.5
Release notes for v1.19.1 seems to indicate that upgrading x/sys@v1.16 fixes some security issue, see https://github.com/prometheus/client_golang/releases/tag/v1.19.1
Release notes for v1.19.1 seems to indicate that upgrading x/sys@v1.16 fixes some security issue, see https://github.com/prometheus/client_golang/releases/tag/v1.19.1