Bump versions after 8.18.7 release

Author: elasticsearchmachine

.backportrc.json

@@ -3,7 +3,7 @@
   "targetBranchChoices" : [ "main", "9.0", "8.19", "8.18", "8.17", "8.16", "8.15", "8.14", "8.13", "8.12", "8.11", "8.10", "8.9", "8.8", "8.7", "8.6", "8.5", "8.4", "8.3", "8.2", "8.1", "8.0", "7.17", "6.8" ],
   "targetPRLabels" : [ "backport" ],
   "branchLabelMapping" : {
-    "^v8.18.7$" : "main",
+    "^v8.18.8$" : "main",
     "^v(\\d+).(\\d+).\\d+(?:-(?:alpha|beta|rc)\\d+)?$" : "$1.$2"
   }
 }

.buildkite/pipelines/intake.yml

@@ -56,7 +56,7 @@ steps:
         timeout_in_minutes: 300
         matrix:
           setup:
-            BWC_VERSION: ["7.17.30", "8.18.7"]
+            BWC_VERSION: ["7.17.30", "8.18.8"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2404

.buildkite/pipelines/periodic-fwc.yml

@@ -10,6 +10,6 @@ steps:
       buildDirectory: /dev/shm/bk
     matrix:
       setup:
-        FWC_VERSION: ["8.18.0", "8.18.1", "8.18.2", "8.18.3", "8.18.4", "8.18.5", "8.18.6"]
+        FWC_VERSION: ["8.18.0", "8.18.1", "8.18.2", "8.18.3", "8.18.4", "8.18.5", "8.18.6", "8.18.7"]
     env:
       FWC_VERSION: "{{matrix.FWC_VERSION}}"