chore(deps): update quay.io/prometheuscommunity/postgres-exporter docker tag to v0.16.0

This MR contains the following updates:

Package	Update	Change
quay.io/prometheuscommunity/postgres-exporter	minor	v0.11.0 -> v0.16.0
quay.io/prometheuscommunity/postgres-exporter	minor	v0.15.0 -> v0.16.0

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