Bump github.com/prometheus/client_golang in /exporters/prometheus

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.14.0 to 1.15.0.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/main/CHANGELOG.md)
- [Commits](prometheus/client_golang@v1.14.0...v1.15.0)

---
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>

exporters/prometheus/go.mod

@@ -3,29 +3,31 @@ module go.opentelemetry.io/otel/exporters/prometheus
 go 1.18
 
 require (
-	github.com/prometheus/client_golang v1.14.0
+	github.com/prometheus/client_golang v1.15.0
 	github.com/prometheus/client_model v0.3.0
 	github.com/stretchr/testify v1.8.2
 	go.opentelemetry.io/otel v1.15.0-rc.1
 	go.opentelemetry.io/otel/metric v1.15.0-rc.1
 	go.opentelemetry.io/otel/sdk v1.15.0-rc.1
 	go.opentelemetry.io/otel/sdk/metric v0.38.0-rc.1
-	google.golang.org/protobuf v1.28.1
+	google.golang.org/protobuf v1.30.0
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/common v0.37.0 // indirect
-	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
 	go.opentelemetry.io/otel/trace v1.15.0-rc.1 // indirect
-	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )