fixed SetOutput() panics on go 1.17 (gin-gonic#2861)

* fixed SetOutput() panics on go 1.17

* update go.sum

(cherry picked from commit 3a6f18f)

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/go-playground/validator/v10 v10.4.1
 	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/mattn/go-isatty v0.0.14
 	github.com/stretchr/testify v1.4.0
 	github.com/ugorji/go/codec v1.1.7
 	gopkg.in/yaml.v2 v2.2.8

go.sum

@@ -1,3 +1,4 @@
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -14,36 +15,51 @@ github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn
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