types: regenerate using latest protobuf v33 release

Change-Id: I4a786adbc7fc1a829e444dcaa0e43d35f42a3be4
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/713180
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

integration_test.go

diff --git a/integration_test.go b/integration_test.go
index aedd2e2..db0a65f 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -33,7 +33,7 @@
 	regenerate   = flag.Bool("regenerate", false, "regenerate files")
 	buildRelease = flag.Bool("buildRelease", false, "build release binaries")
 
-	protobufVersion = "32.0"
+	protobufVersion = "33.0"
 
 	golangVersions = func() []string {
 		// Version policy: oldest supported version of Go, plus the version before that.

types/descriptorpb/descriptor.pb.go

diff --git a/types/descriptorpb/descriptor.pb.go b/types/descriptorpb/descriptor.pb.go
index 4eacb52..dc669b6 100644
--- a/types/descriptorpb/descriptor.pb.go
+++ b/types/descriptorpb/descriptor.pb.go
@@ -4793,11 +4793,11 @@
 	"\x18EnumValueDescriptorProto\x12\x12\n" +
 	"\x04name\x18\x01 \x01(\tR\x04name\x12\x16\n" +
 	"\x06number\x18\x02 \x01(\x05R\x06number\x12;\n" +
-	"\aoptions\x18\x03 \x01(\v2!.google.protobuf.EnumValueOptionsR\aoptions\"\xa7\x01\n" +
+	"\aoptions\x18\x03 \x01(\v2!.google.protobuf.EnumValueOptionsR\aoptions\"\xb5\x01\n" +
 	"\x16ServiceDescriptorProto\x12\x12\n" +
 	"\x04name\x18\x01 \x01(\tR\x04name\x12>\n" +
 	"\x06method\x18\x02 \x03(\v2&.google.protobuf.MethodDescriptorProtoR\x06method\x129\n" +
-	"\aoptions\x18\x03 \x01(\v2\x1f.google.protobuf.ServiceOptionsR\aoptions\"\x89\x02\n" +
+	"\aoptions\x18\x03 \x01(\v2\x1f.google.protobuf.ServiceOptionsR\aoptionsJ\x04\b\x04\x10\x05R\x06stream\"\x89\x02\n" +
 	"\x15MethodDescriptorProto\x12\x12\n" +
 	"\x04name\x18\x01 \x01(\tR\x04name\x12\x1d\n" +
 	"\n" +

types/known/timestamppb/timestamp.pb.go

diff --git a/types/known/timestamppb/timestamp.pb.go b/types/known/timestamppb/timestamp.pb.go
index 06d584c..484c21f 100644
--- a/types/known/timestamppb/timestamp.pb.go
+++ b/types/known/timestamppb/timestamp.pb.go
@@ -172,13 +172,14 @@
 // ) to obtain a formatter capable of generating timestamps in this format.
 type Timestamp struct {
 	state protoimpl.MessageState `protogen:"open.v1"`
-	// Represents seconds of UTC time since Unix epoch
-	// 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
-	// 9999-12-31T23:59:59Z inclusive.
+	// Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must
+	// be between -315576000000 and 315576000000 inclusive (which corresponds to
+	// 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z).
 	Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
-	// Non-negative fractions of a second at nanosecond resolution. Negative
-	// second values with fractions must still have non-negative nanos values
-	// that count forward in time. Must be from 0 to 999,999,999
+	// Non-negative fractions of a second at nanosecond resolution. This field is
+	// the nanosecond portion of the duration, not an alternative to seconds.
+	// Negative second values with fractions must still have non-negative nanos
+	// values that count forward in time. Must be between 0 and 999,999,999
 	// inclusive.
 	Nanos         int32 `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
 	unknownFields protoimpl.UnknownFields