docs: update elementary version references from 0.22.0 to 0.23.0

[devin-ai-integration]

Summary

Updates all Elementary dbt package version references in the docs from 0.22.0 to 0.23.0. Changes span two files:

• docs/snippets/quickstart-package-install.mdx — version in the packages.yml example
• docs/data-tests/dbt/upgrade-package.mdx — version in the packages.yml example + minor version upgrade example text (0.22.X -> 0.23.X)

Review & Testing Checklist for Human

• Verify that 0.23.0 is the correct latest version to reference (i.e., the package has actually been published to the dbt hub)
• Confirm no other docs pages reference 0.22 as a version that should also be updated (grep was run and only these two files had relevant hits)

Notes

• The upgrade example text was also bumped from "0.21.X -> 0.22.X" to "0.22.X -> 0.23.X" to stay current.

Link to Devin session: https://app.devin.ai/sessions/fec5210be6874e6ba5f52b8b7ae6d638
Requested by: @MikaKerman

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