Bump google.golang.org/protobuf from 1.28.1 to 1.33.0 in /tests

Bumps google.golang.org/protobuf from 1.28.1 to 1.33.0.

---
updated-dependencies:
- dependency-name: google.golang.org/protobuf
  dependency-type: indirect
...

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

tests/go.mod

@@ -53,6 +53,6 @@ require (
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20221025140454-527a21cfbd71 // indirect
 	google.golang.org/grpc v1.50.1 // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )