Chore(deps): Bump github.com/prometheus/client_golang (#30585)

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.8.0 to 1.9.0.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prometheus/client_golang/compare/v1.8.0...v1.9.0)

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

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

go.mod

@@ -63,7 +63,7 @@ require (
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.8.0
+	github.com/prometheus/client_golang v1.9.0
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.15.0
 	github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
@@ -84,7 +84,6 @@ require (
 	golang.org/x/net v0.0.0-20201022231255-08b38378de70
 	golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43
 	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
-	golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd // indirect
 	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
 	gonum.org/v1/gonum v0.6.0
 	google.golang.org/api v0.33.0

go.sum

@@ -1147,8 +1147,8 @@ github.com/prometheus/client_golang v1.4.1/go.mod h1:e9GMxYsXl05ICDXkRhurwBS4Q3O
 github.com/prometheus/client_golang v1.6.0/go.mod h1:ZLOG9ck3JLRdB5MgO8f+lLTe83AXG6ro35rLTxvnIl4=
 github.com/prometheus/client_golang v1.7.1 h1:NTGy1Ja9pByO+xAeH/qiWnLrKtr3hJPNjaVUwnjpdpA=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
-github.com/prometheus/client_golang v1.8.0 h1:zvJNkoCFAnYFNC24FV8nW4JdRJ3GIFcLbg65lL/JDcw=
-github.com/prometheus/client_golang v1.8.0/go.mod h1:O9VU6huf47PktckDQfMTX0Y8tY0/7TSWwj+ITvv0TnM=
+github.com/prometheus/client_golang v1.9.0 h1:Rrch9mh17XcxvEu9D9DEpb4isxjGBtcevQjKvxPRQIU=
+github.com/prometheus/client_golang v1.9.0/go.mod h1:FqZLKOZnGdFAhOK4nqGHa7D66IdsO+O441Eve7ptJDU=
 github.com/prometheus/client_model v0.0.0-20170216185247-6f3806018612/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
@@ -1682,9 +1682,8 @@ golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200918174421-af09f7315aff/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201008064518-c1f3e3309c71/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd h1:WgqgiQvkiZWz7XLhphjt2GI2GcGCTIZs9jqXMWmH+oc=
-golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e h1:AyodaIpKjppX+cBfTASF2E1US3H2JFBj920Ot3rtDjs=
+golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=