Upgrade x/sync, Prometheus client and faas-provider

gateway/go.mod

gateway/go.sum

gateway/vendor/github.com/golang/protobuf/ptypes/any.go

...ay/vendor/github.com/golang/protobuf/ptypes/any/any.pb.go

gateway/vendor/github.com/golang/protobuf/ptypes/doc.go

gateway/vendor/github.com/golang/protobuf/ptypes/duration.go

...github.com/golang/protobuf/ptypes/duration/duration.pb.go

...way/vendor/github.com/golang/protobuf/ptypes/timestamp.go

...thub.com/prometheus/client_golang/prometheus/collector.go

...github.com/prometheus/client_golang/prometheus/counter.go

...or/github.com/prometheus/client_golang/prometheus/desc.go

...github.com/prometheus/client_golang/prometheus/get_pid.go

...m/prometheus/client_golang/prometheus/get_pid_gopherjs.go

...b.com/prometheus/client_golang/prometheus/go_collector.go

...rometheus/client_golang/prometheus/go_collector_latest.go

...thub.com/prometheus/client_golang/prometheus/histogram.go

...m/prometheus/client_golang/prometheus/internal/difflib.go

...client_golang/prometheus/internal/go_collector_options.go

...s/client_golang/prometheus/internal/go_runtime_metrics.go

...om/prometheus/client_golang/prometheus/internal/metric.go