Bump github.com/prometheus/client_golang in /examples/middleware

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.13.1 to 1.16.0.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/main/CHANGELOG.md)
- [Commits](v1.13.1...v1.16.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

examples/middleware/go.mod

@@ -2,16 +2,16 @@ module github.com/jessicalins/instrumentation-practices-examples/middleware
 
 go 1.19
 
-require github.com/prometheus/client_golang v1.13.1
+require github.com/prometheus/client_golang v1.16.0
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.37.0 // indirect
-	github.com/prometheus/procfs v0.8.0 // indirect
-	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.10.1 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
 )