Update dependency org.postgresql:postgresql to v42.7.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.postgresql:postgresql (source)	42.7.5 -> 42.7.6

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Release Notes

pgjdbc/pgjdbc (org.postgresql:postgresql)

v42.7.6

Features

• fix: Enhanced DatabaseMetadata.getIndexInfo() method, added index comment as REMARKS property PR #​3513

Performance Improvements

• performance: Improve ResultSetMetadata.fetchFieldMetaData by using IN row values instead of UNION ALL for improved query performance (later reverted) PR #​3510
• feat:Use a single simple query for all startup parameters, so groupStartupParameters is no longer needed PR #​3613

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