Bump golang.org/x/net from 0.9.0 to 0.17.0 in /samples/pubsub

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.9.0 to 0.17.0.
- [Commits](golang/net@v0.9.0...v0.17.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

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

samples/pubsub/go.mod

@@ -27,11 +27,11 @@ require (
 	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
 	go.uber.org/zap v1.10.0 // indirect
-	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/oauth2 v0.7.0 // indirect
 	golang.org/x/sync v0.1.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
-	golang.org/x/text v0.9.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
 	google.golang.org/api v0.114.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect