chore(deps): update postgres docker tag to v18

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	17-alpine → 18-alpine

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This PR targeted main, which is only the default/static branch.

I retargeted it to v0.40-dev, the active development branch. Pushes to v0.40-dev automatically fast-forward main.

[github-actions]

This PR targeted main, which is only the default/static branch.

I retargeted it to v0.40-dev, the active development branch. Pushes to v0.40-dev automatically fast-forward main.

[github-actions]

This PR targeted main, which is only the default/static branch.

I retargeted it to v0.40-dev, the active development branch. Pushes to v0.40-dev automatically fast-forward main.

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