Update Sarama to 1.29.1 (#27717)

Author: faec

CHANGELOG.next.asciidoc

@@ -519,6 +519,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - update ECS field definitions to ECS 1.11.0. {pull}27107[27107]
 - The disk queue is now GA. {pull}27515[27515]
 - Allow non-padded base64 data to be decoded by decode_base64_field {pull}27311[27311], {issue}27021[27021]
+- The Kafka support library Sarama has been updated to 1.29.1. {pull}27717[27717]
 
 *Auditbeat*