deps: Bump oblt-cli version to 7.5.21

[obltmachine]

deps: Bump oblt-cli version

deps(oblt-cli): Bump oblt-cli version to 7.5.21

1 file(s) updated with "7.5.21\n": * oblt-cli/setup/.default-oblt-cli-version

7.5.21

Release published on the 2024-09-10 11:00:24 +0000 UTC at the url https://github.com/elastic/observability-test-environments/releases/tag/7.5.21

### Changes

- Fix external secret for otel-collector @reakaleek (#47244)

## 🚀 Features

- Update docs-update-clusters-list.yml @kuisathaverat (#47272)
- feat: workflow to update the landing page @kuisathaverat (#47268)

## 🐛 Bug Fixes

- fix: terraform syntax error @kuisathaverat (#47843)
- fix: show list of users @kuisathaverat (#47651)

## 📚 Documentation

- docs: add max\_mem docs @kuisathaverat (#47660)
- docs: improve clusters list @kuisathaverat (#47248)
- docs: PoC of a landing page for the oblt clusters @kuisathaverat (#46688)

## 🧰 Maintenance

- build(deps): bump the github-actions group across 2 directories with 4 updates @dependabot (#47408)
- build(deps): bump ansible-compat from 24.8.0 to 24.9.0 in /ansible in the ansible group @dependabot (#47703)
- build(deps): bump cffi from 1.17.0 to 1.17.1 in /ansible @dependabot (#47704)
- build(deps): bump sqlalchemy from 2.0.32 to 2.0.34 in /ansible @dependabot (#47706)
- chore: add Random number at the end of the test cluster name @kuisathaverat (#47845)
- Update Helm Charts @obltmachine (#47740)
- Update Helm Charts @obltmachine (#47418)
- Update Elastic Stack @obltmachine (#47434)
- Update Helm Charts @obltmachine (#47081)
- Update Go @obltmachine (#47114)
- Update Oblt Framework @obltmachine (#46767)
- Update Helm Charts @obltmachine (#46739)
- [updatecli][release-oblt] Update Elastic Stack @obltmachine (#46120)

**Full Changelog**: https://github.com/elastic/observability-test-environments/compare/7.5.20...7.5.21

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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