chore: [updatecli] [weekly] Update latest snapshot to 8.19.7-SNAPSHOT (elastic#15812)

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Author: github-actions[bot]

.buildkite/pipeline.schedule-weekly.yml

@@ -21,7 +21,7 @@ steps:
       env:
         SERVERLESS: "false"
         FORCE_CHECK_ALL: "true"
-        STACK_VERSION: 8.19.6-SNAPSHOT
+        STACK_VERSION: 8.19.7-SNAPSHOT
         PUBLISH_COVERAGE_REPORTS: "false"
         ELASTIC_PACKAGE_DISABLE_ELASTIC_AGENT_WOLFI: "true"
     depends_on: