Update prometheuscommunity/postgres-exporter digest to dd99254

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	Sourcegraph
prometheuscommunity/postgres-exporter	stage	digest	v0.9.0

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

Test plan: CI should pass with updated dependencies.

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