deps: Bump oblt-cli version to 7.15.0

[elastic-observability-automation]

deps: Bump oblt-cli version

deps(oblt-cli): Bump oblt-cli version to 7.15.0

1 file(s) updated with "oblt-cli 7.15.0": * tests/oblt-cli/version/.tool-versions

7.15.0

Release published on the 2025-02-20 09:49:01 +0000 UTC at the url https://github.com/elastic/observability-test-environments/releases/tag/7.15.0

### Changes



**Full Changelog**: https://github.com/elastic/observability-test-environments/compare/7.14.0...7.15.0

For more information, please visit:
  * clusters docs at https://ela.st/oblt-clusters
  * oblt-cli docs at https://ela.st/oblt-cli
  * oblt-robot docs at https://ela.st/oblt-robot
  * Serverless docs at https://ela.st/oblt-serverless

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