rsyslog: 8.1907.0 -> 8.1910.0 (#69954)

* rsyslog: 8.1907.0 -> 8.1908.0

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/rsyslog/versions

* rsyslog: 8.1908.0 -> 8.1910.0

Changelog:
https://raw.githubusercontent.com/rsyslog/rsyslog/v8.1910.0/ChangeLog

Security fix: CVE-2019-17040