chore(deps): Bump untergeek/curator (#2969)

Bumps untergeek/curator from 8.0.2 to 8.0.15.

---
updated-dependencies:
- dependency-name: untergeek/curator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: jamshale <31809382+jamshale@users.noreply.github.com>

demo/elk-stack/extensions/curator/Dockerfile

@@ -1,4 +1,4 @@
-FROM untergeek/curator:8.0.2
+FROM untergeek/curator:8.0.15
 
 USER root