Update logstash_releases.json after 8.18.0 (#17506)

Author: andsel

Diff for: ci/logstash_releases.json

@@ -1,15 +1,14 @@
 {
   "releases": {
     "7.current": "7.17.28",
-    "8.previous": "8.16.6",
-    "8.current": "8.17.4"
+    "8.previous": "8.17.4",
+    "8.current": "8.18.0"
   },
   "snapshots": {
     "7.current": "7.17.29-SNAPSHOT",
-    "8.previous": "8.16.7-SNAPSHOT",
-    "8.current": "8.17.5-SNAPSHOT",
-    "8.next": "8.18.0-SNAPSHOT",
-    "8.future": "8.19.0-SNAPSHOT",
+    "8.previous": "8.17.5-SNAPSHOT",
+    "8.current": "8.18.1-SNAPSHOT",
+    "8.next": "8.19.0-SNAPSHOT",
     "9.next": "9.0.0-SNAPSHOT",
     "main": "9.1.0-SNAPSHOT"
   }