Beats version 7.13.3

Filebeat

Fix bug in aws-s3 input where the end of gzipped log files might have been discarded. 26260
Clone value when copy fields in processors to avoid crash. 19206 20500
Fix bug in httpjson that prevented first_event getting updated. 26407
Fix bug in the Syslog input that misparsed rfc5424 days starting with 0. 26419