go.mod: update golang.org/x dependencies

Update golang.org/x dependencies to their latest tagged versions.
Once this CL is submitted, and post-submit testing succeeds on all
first-class ports across all supported Go versions, this repository
will be tagged with its next minor version.

Change-Id: I6b389549fe4bc53a62cb383c5fb10156ccfcffba
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/507840
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Gopher Robot <gobot@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

go.mod

@@ -3,13 +3,14 @@ module golang.org/x/oauth2
 go 1.17
 
 require (
-	cloud.google.com/go/compute/metadata v0.2.0
-	github.com/google/go-cmp v0.5.8
+	cloud.google.com/go/compute/metadata v0.2.3
+	github.com/google/go-cmp v0.5.9
 	google.golang.org/appengine v1.6.7
 )
 
 require (
-	github.com/golang/protobuf v1.5.2 // indirect
-	golang.org/x/net v0.10.0 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
+	cloud.google.com/go/compute v1.20.1 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	golang.org/x/net v0.12.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 )