Regenerate protos (#2039)

swift-protobuf 1.28.1 includes generated code changes, our. CI fails
without regenerating.

Author: glbrntt

Sources/InteroperabilityTests/Generated/empty.pb.swift

@@ -22,7 +22,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import Foundation
 import SwiftProtobuf
 
 // If the compiler emits an error on this type, it is because this file

Sources/InteroperabilityTests/Generated/empty_service.pb.swift

@@ -22,15 +22,4 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import Foundation
-import SwiftProtobuf
-
-// If the compiler emits an error on this type, it is because this file
-// was generated by a version of the `protoc` Swift plug-in that is
-// incompatible with the version of SwiftProtobuf to which you are linking.
-// Please ensure that you are building against the same version of the API
-// that was used to generate this file.
-fileprivate struct _GeneratedWithProtocGenSwiftVersion: SwiftProtobuf.ProtobufAPIVersionCheck {
-  struct _2: SwiftProtobuf.ProtobufAPIVersion_2 {}
-  typealias Version = _2
-}
+// This file contained no messages, enums, or extensions.

Sources/InteroperabilityTests/Generated/test.pb.swift

@@ -25,15 +25,4 @@
 // An integration test service that covers all the method signature permutations
 // of unary/streaming requests/responses.
 
-import Foundation
-import SwiftProtobuf
-
-// If the compiler emits an error on this type, it is because this file
-// was generated by a version of the `protoc` Swift plug-in that is
-// incompatible with the version of SwiftProtobuf to which you are linking.
-// Please ensure that you are building against the same version of the API
-// that was used to generate this file.
-fileprivate struct _GeneratedWithProtocGenSwiftVersion: SwiftProtobuf.ProtobufAPIVersionCheck {
-  struct _2: SwiftProtobuf.ProtobufAPIVersion_2 {}
-  typealias Version = _2
-}
+// This file contained no messages, enums, or extensions.

Sources/Services/Health/Generated/health.pb.swift

@@ -25,7 +25,6 @@
 // The canonical version of this proto can be found at
 // https://github.com/grpc/grpc-proto/blob/master/grpc/health/v1/health.proto
 
-import Foundation
 import SwiftProtobuf
 
 // If the compiler emits an error on this type, it is because this file