build(deps): bump github.com/grpc-ecosystem/grpc-gateway/v2

Bumps [github.com/grpc-ecosystem/grpc-gateway/v2](https://github.com/grpc-ecosystem/grpc-gateway) from 2.26.1 to 2.26.3.
- [Release notes](https://github.com/grpc-ecosystem/grpc-gateway/releases)
- [Changelog](https://github.com/grpc-ecosystem/grpc-gateway/blob/main/.goreleaser.yml)
- [Commits](https://github.com/grpc-ecosystem/grpc-gateway/compare/v2.26.1...v2.26.3)

---
updated-dependencies:
- dependency-name: github.com/grpc-ecosystem/grpc-gateway/v2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/errors.go

@@ -148,22 +148,20 @@ func DefaultHTTPErrorHandler(ctx context.Context, mux *ServeMux, marshaler Marsh
 	}
 
 	md, ok := ServerMetadataFromContext(ctx)
-	if !ok {
-		grpclog.Error("Failed to extract ServerMetadata from context")
-	}
+	if ok {
+		handleForwardResponseServerMetadata(w, mux, md)
 
-	handleForwardResponseServerMetadata(w, mux, md)
+		// RFC 7230 https://tools.ietf.org/html/rfc7230#section-4.1.2
+		// Unless the request includes a TE header field indicating "trailers"
+		// is acceptable, as described in Section 4.3, a server SHOULD NOT
+		// generate trailer fields that it believes are necessary for the user
+		// agent to receive.
+		doForwardTrailers := requestAcceptsTrailers(r)
 
-	// RFC 7230 https://tools.ietf.org/html/rfc7230#section-4.1.2
-	// Unless the request includes a TE header field indicating "trailers"
-	// is acceptable, as described in Section 4.3, a server SHOULD NOT
-	// generate trailer fields that it believes are necessary for the user
-	// agent to receive.
-	doForwardTrailers := requestAcceptsTrailers(r)
-
-	if doForwardTrailers {
-		handleForwardResponseTrailerHeader(w, mux, md)
-		w.Header().Set("Transfer-Encoding", "chunked")
+		if doForwardTrailers {
+			handleForwardResponseTrailerHeader(w, mux, md)
+			w.Header().Set("Transfer-Encoding", "chunked")
+		}
 	}
 
 	st := HTTPStatusFromCode(s.Code())
@@ -176,7 +174,7 @@ func DefaultHTTPErrorHandler(ctx context.Context, mux *ServeMux, marshaler Marsh
 		grpclog.Errorf("Failed to write response: %v", err)
 	}
 
-	if doForwardTrailers {
+	if ok && requestAcceptsTrailers(r) {
 		handleForwardResponseTrailer(w, mux, md)
 	}
 }

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/handler.go

@@ -153,12 +153,10 @@ type responseBody interface {
 // ForwardResponseMessage forwards the message "resp" from gRPC server to REST client.
 func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marshaler, w http.ResponseWriter, req *http.Request, resp proto.Message, opts ...func(context.Context, http.ResponseWriter, proto.Message) error) {
 	md, ok := ServerMetadataFromContext(ctx)
-	if !ok {
-		grpclog.Error("Failed to extract ServerMetadata from context")
+	if ok {
+		handleForwardResponseServerMetadata(w, mux, md)
 	}
 
-	handleForwardResponseServerMetadata(w, mux, md)
-
 	// RFC 7230 https://tools.ietf.org/html/rfc7230#section-4.1.2
 	// Unless the request includes a TE header field indicating "trailers"
 	// is acceptable, as described in Section 4.3, a server SHOULD NOT
@@ -166,7 +164,7 @@ func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marsha
 	// agent to receive.
 	doForwardTrailers := requestAcceptsTrailers(req)
 
-	if doForwardTrailers {
+	if ok && doForwardTrailers {
 		handleForwardResponseTrailerHeader(w, mux, md)
 		w.Header().Set("Transfer-Encoding", "chunked")
 	}
@@ -204,7 +202,7 @@ func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marsha
 		grpclog.Errorf("Failed to write response: %v", err)
 	}
 
-	if doForwardTrailers {
+	if ok && doForwardTrailers {
 		handleForwardResponseTrailer(w, mux, md)
 	}
 }