Update vendoring

vendor/github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute/decode.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"reflect"
 	"strconv"
+	"time"
 
 	"github.com/aws/aws-sdk-go/service/dynamodb"
 )
@@ -454,6 +455,17 @@ func (d *Decoder) decodeString(s *string, v reflect.Value, fieldTag tag) error {
 		return d.decodeNumber(s, v)
 	}
 
+	// To maintain backwards compatibility with ConvertFrom family of methods which
+	// converted strings to time.Time structs
+	if _, ok := v.Interface().(time.Time); ok {
+		t, err := time.Parse(time.RFC3339, *s)
+		if err != nil {
+			return err
+		}
+		v.Set(reflect.ValueOf(t))
+		return nil
+	}
+
 	switch v.Kind() {
 	case reflect.String, reflect.Interface:
 		v.Set(reflect.ValueOf(*s))

vendor/github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute/encode.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"reflect"
 	"strconv"
+	"time"
 
 	"github.com/aws/aws-sdk-go/service/dynamodb"
 )
@@ -215,6 +216,15 @@ func (e *Encoder) encode(av *dynamodb.AttributeValue, v reflect.Value, fieldTag
 }
 
 func (e *Encoder) encodeStruct(av *dynamodb.AttributeValue, v reflect.Value) error {
+
+	// To maintain backwards compatibility with ConvertTo family of methods which
+	// converted time.Time structs to strings
+	if t, ok := v.Interface().(time.Time); ok {
+		s := t.Format(time.RFC3339Nano)
+		av.S = &s
+		return nil
+	}
+
 	av.M = map[string]*dynamodb.AttributeValue{}
 	fields := unionStructFields(v.Type(), e.MarshalOptions)
 	for _, f := range fields {