Bump github.com/go-micro/plugins/v4/client/grpc from 1.2.0 to 1.2.1

Bumps [github.com/go-micro/plugins/v4/client/grpc](https://github.com/go-micro/plugins) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/go-micro/plugins/releases)
- [Commits](https://github.com/go-micro/plugins/compare/v4/auth/jwt/v1.2.0...v4/logger/zap/v1.2.1)

---
updated-dependencies:
- dependency-name: github.com/go-micro/plugins/v4/client/grpc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

vendor/github.com/go-micro/plugins/v4/client/grpc/grpc.go

@@ -205,6 +205,11 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
 	header["x-content-type"] = req.ContentType()
 
 	md := gmetadata.New(header)
+
+	// WebSocket connection adds the `Connection: Upgrade` header.
+	// But as per the HTTP/2 spec, the `Connection` header makes the request malformed
+	delete(md, "connection")
+
 	ctx = gmetadata.NewOutgoingContext(ctx, md)
 
 	cf, err := g.newGRPCCodec(req.ContentType())