public Builder providerArns(List<String> providerArns) {
            clearProviderArns();
            this.providerArns.get().addAll(providerArns);
            return this;
        }
Sets the provider ARNs.

@param providerArns ARNS to set.
@return Returns the builder.
smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/auth/CognitoUserPoolsTrait.java