Update dependency org.postgresql:postgresql to v42.5.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.postgresql:postgresql (source)	42.5.3 -> 42.5.4

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Release Notes

pgjdbc/pgjdbc

v42.5.4

Fixed

fix: fix testGetSQLTypeQueryCache by searching for xid type. We used to search for box type but it is now cached. xid is not cached, this nuance is required for the test.
fix OidValueCorrectnessTest BOX_ARRAY OID, by adding BOX_ARRAY to the oidTypeName map [PR #​2810](https://github.com/pgjdbc/pgjdbc/pull/28100).
fixes Issue #​2804.
fix: Make sure that github CI runs tests on all(https://togithub.com/pgjdbc/pgjdbc/pull/2809)dbc/pgjdbc/pull/2809\)).

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[coveralls]

Coverage: 87.183%. Remained the same when pulling 9c9caa5 on renovate/org.postgresql-postgresql-42.x into db754ce on master.