chore(spanner): regenerate proto files and fix tests (#10242)

* fix(spanner): fix arguments used in integration test

* fix(spanner): regenerate proto files with latest protoc version

* fix(spanner): regenerate proto files with latest protoc version

* fix(spanner): fix vet

* fix(spanner): fix vet

* fix(spanner): use switch case to handle pointer

Author: harshachinta

spanner/integration_test.go

@@ -2463,7 +2463,16 @@ func TestIntegration_BasicTypes_ProtoColumns(t *testing.T) {
 		if want == nil {
 			want = test.val
 		}
-		gotp := reflect.New(reflect.TypeOf(want))
+
+		var gotp reflect.Value
+		switch want.(type) {
+		case proto.Message:
+			// We are passing a pointer of proto message in `want` due to `go vet` issue.
+			// Through the switch case, we are dereferencing the value so that we get proto message instead of its pointer.
+			gotp = reflect.New(reflect.TypeOf(want).Elem())
+		default:
+			gotp = reflect.New(reflect.TypeOf(want))
+		}
 		v := gotp.Interface()
 
 		switch nullValue := v.(type) {

spanner/testdata/protos/descriptors.pb

@@ -14,10 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-syntax = "proto2";
+syntax = "proto3";
 
 package examples.spanner.music;
-option go_package = "./";
+option go_package = "protos/";
 
 message SingerInfo {
   optional int64 singer_id = 1;