[8.x] fix(slo): Use correct calendar period (elastic#199873) (elastic…

…#200069)

# Backport

This will backport the following commits from `main` to `8.x`:
- [fix(slo): Use correct calendar period
(elastic#199873)](elastic#199873)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Kevin
Delemme","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-11-13T18:39:45Z","message":"fix(slo):
Use correct calendar period
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Use correct calendar
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Use correct calendar period
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Use correct calendar period
(elastic#199873)","sha":"3cbdcc3609269dcf109fe787359b2504203da229"}},{"branch":"8.x","label":"v8.17.0","branchLabelMappingKey":"^v8.17.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Kevin Delemme <[email protected]>