Update aws-sdk-go dependency to v1.28.2

vendor/github.com/aws/aws-sdk-go/private/protocol/json/jsonutil/BUILD

@@ -11,6 +11,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//vendor/github.com/aws/aws-sdk-go/aws:go_default_library",
+        "//vendor/github.com/aws/aws-sdk-go/aws/awserr:go_default_library",
         "//vendor/github.com/aws/aws-sdk-go/private/protocol:go_default_library",
     ],
 )

vendor/github.com/aws/aws-sdk-go/private/protocol/json/jsonutil/unmarshal.go

@@ -1,6 +1,7 @@
 package jsonutil
 
 import (
+	"bytes"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -9,9 +10,30 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/private/protocol"
 )
 
+// UnmarshalJSONError unmarshal's the reader's JSON document into the passed in
+// type. The value to unmarshal the json document into must be a pointer to the
+// type.
+func UnmarshalJSONError(v interface{}, stream io.Reader) error {
+	var errBuf bytes.Buffer
+	body := io.TeeReader(stream, &errBuf)
+
+	err := json.NewDecoder(body).Decode(v)
+	if err != nil {
+		msg := "failed decoding error message"
+		if err == io.EOF {
+			msg = "error message missing"
+			err = nil
+		}
+		return awserr.NewUnmarshalError(err, msg, errBuf.Bytes())
+	}
+
+	return nil
+}
+
 // UnmarshalJSON reads a stream and unmarshals the results in object v.
 func UnmarshalJSON(v interface{}, stream io.Reader) error {
 	var out interface{}