chore(deps): bump postgresql from 16.7.27 to 18.11.1 in /charts/trueforge in the helm group across 1 directory

[dependabot]

Bumps the helm group with 1 update in the /charts/trueforge directory: postgresql.

Updates postgresql from 16.7.27 to 18.11.1

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Note

Medium Risk
A major jump in the bundled Postgres subchart can change default templates/behavior for deployments with postgresql.enabled=true, even though application values in this PR are unchanged.

Overview
Updates the TrueForge Helm chart’s bundled Bitnami postgresql dependency from 16.7.27 to 18.11.1 in Chart.yaml and refreshes Chart.lock (version pin, digest, and generated timestamp). Redis stays at 24.0.0; no other chart files change in this diff.

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Latest commit: 007e8ce

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