fix(postgres): rebuild image to resolve CVEs (#936)

The daily CVE scan detected fixable vulnerabilities in the published
`cortex-postgres` image. A test rebuild confirms that rebuilding
reduces the CVE count (via `apt-get upgrade` picking up security
patches).

Merging this PR triggers the image rebuild and publish pipeline.

This PR was created automatically by the `rebuild-postgres` workflow.

Co-authored-by: umswmayj <140147670+umswmayj@users.noreply.github.com>

Author: github-actions[bot]

postgres/rebuild-trigger

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