build(deps): bump github.com/prometheus/client_golang (#52)

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.9.0 to 1.11.0.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/master/CHANGELOG.md)
- [Commits](prometheus/client_golang@v1.9.0...v1.11.0)

---
updated-dependencies:
- dependency-name: github.com/prometheus/client_golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/go-ping/ping v0.0.0-20210216210419-25d1413fb7bb
 	github.com/gobwas/ws v1.1.0
 	github.com/gorilla/mux v1.8.0
-	github.com/prometheus/client_golang v1.9.0
+	github.com/prometheus/client_golang v1.11.0
 	github.com/urfave/cli/v2 v2.3.0
 	github.com/xtaci/smux v1.5.16
 	github.com/xtls/xray-core v1.5.2
@@ -24,8 +24,8 @@ require (
 	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/pires/go-proxyproto v0.6.1 // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.15.0 // indirect
-	github.com/prometheus/procfs v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
 	github.com/russross/blackfriday/v2 v2.0.1 // indirect
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect