sysutils/logstash7: Update to 7.9.2

Changelog since 7.9.1:

• Notable issues fixed
  • Secret store thread safety issues with multiple pipelines
    • Since 7.8.0, a change to optimise the speed of loading variables from the Logstash Secret Store could cause Logstash not to be able to start when the feature was used in conjunction with multiple pipelines.
  • App Search output startup failure
    • Since 7.9.0, a regression was introduced which prevented pipelines using the Elastic App Search output from starting.
• Compatibility notice: Logstash and JDK 15
  • Logstash is not yet compatible with JDK 15.
    • While we are working to support JDK 15, we encourage you to use supported JDK versions (8, 11 or 14). See Java (JVM) version for details and the Elastic Support Matrix for the official word on supported versions across products and releases.
• Plugins
  • Sleep Filter - 3.0.7
    • Changed Fixnum to Integer. Fixnum was deprecated in ruby 2.4.
  • Elastic_app_search Output - 1.1.1
    • Added missed dependency (elastic-app-search) to the gemspec

Release notes:
https://www.elastic.co/guide/en/logstash/current/logstash-7-9-2.html

PR: 249913
Submitted by: Juraj Lutter <juraj@lutter.sk>