Upgrade github.com/ugorji/go/codec
Fixes #2726
go.mod
module github.com/gin-gonic/gin

go 1.13

require (
	github.com/gin-contrib/sse v0.1.0
	github.com/go-playground/validator/v10 v10.6.1
	github.com/goccy/go-json v0.5.1
	github.com/golang/protobuf v1.3.3
	github.com/json-iterator/go v1.1.9
	github.com/mattn/go-isatty v0.0.12
	github.com/stretchr/testify v1.4.0
	github.com/ugorji/go/codec v1.1.7
	gopkg.in/yaml.v2 v2.2.8
)

module github.com/gin-gonic/gin

go 1.13

require (
	github.com/gin-contrib/sse v0.1.0
	github.com/go-playground/validator/v10 v10.6.1
	github.com/goccy/go-json v0.5.1
	github.com/golang/protobuf v1.3.3
	github.com/json-iterator/go v1.1.9
	github.com/mattn/go-isatty v0.0.12
	github.com/stretchr/testify v1.4.0
	github.com/ugorji/go/codec v1.2.6
	gopkg.in/yaml.v2 v2.2.8
)

It seems to be automatic generated when I run go mod tidy after upgrading github.com/ugorji/go/codec