Update dependency org.postgresql:postgresql to v42.7.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.postgresql:postgresql (source)	42.7.2 -> 42.7.3

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Release Notes

pgjdbc/pgjdbc (org.postgresql:postgresql)

v42.7.3

Changed

• chore: gradle config enforces 17+ PR #​3147

Fixed

• fix: boolean types not handled in SimpleQuery mode PR #​3146
  • make sure we handle boolean types in simple query mode
  • support uuid as well
  • handle all well known types in text mode and change else if to switch
• fix: released new versions of 42.2.29, 42.3.10, 42.4.5, 42.5.6, 42.6.2 to deal with NoSuchMethodError on ByteBuffer#position when running on Java 8

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