Update aws-sdk-go dependency to v1.28.2

vendor/github.com/aws/aws-sdk-go/service/sts/customizations.go

@@ -3,10 +3,9 @@ package sts
 import "github.com/aws/aws-sdk-go/aws/request"
 
 func init() {
-	initRequest = func(r *request.Request) {
-		switch r.Operation.Name {
-		case opAssumeRoleWithSAML, opAssumeRoleWithWebIdentity:
-			r.Handlers.Sign.Clear() // these operations are unsigned
-		}
-	}
+	initRequest = customizeRequest
+}
+
+func customizeRequest(r *request.Request) {
+	r.RetryErrorCodes = append(r.RetryErrorCodes, ErrCodeIDPCommunicationErrorException)
 }