chore: [updatecli] Update 7.x snapshot to 7.17.26-SNAPSHOT (elastic#11648)

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Author: github-actions[bot]

.buildkite/pipeline.schedule-daily.yml

@@ -21,7 +21,7 @@ steps:
       env:
         SERVERLESS: "false"
         FORCE_CHECK_ALL: "true"
-        STACK_VERSION: 7.17.25-SNAPSHOT
+        STACK_VERSION: 7.17.26-SNAPSHOT
     depends_on:
       - step: "check"
         allow_failure: false