Bump the 8.19 stack version to 8.19.8 (#3289)

Author: shainaraskas

shared/versions/stack/8.19.asciidoc

@@ -1,12 +1,12 @@
-:version:                8.19.7
+:version:                8.19.8
 ////
 bare_version never includes -alpha or -beta
 ////
-:bare_version:           8.19.7
-:logstash_version:       8.19.7
-:elasticsearch_version:  8.19.7
-:kibana_version:         8.19.7
-:apm_server_version:     8.19.7
+:bare_version:           8.19.8
+:logstash_version:       8.19.8
+:elasticsearch_version:  8.19.8
+:kibana_version:         8.19.8
+:apm_server_version:     8.19.8
 :branch:                 8.19
 :minor-version:          8.19
 :major-version:          8.x