test: remove pgxv4 from integration test setup

This is a clean up that was due after claircore and clients switched
fully to pgxv5.

Signed-off-by: crozzy <joseph.crosland@gmail.com>

Author: crozzy

go.mod

@@ -10,7 +10,6 @@ require (
 	github.com/google/go-cmp v0.7.0
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgconn v1.14.3
-	github.com/jackc/pgx/v4 v4.18.3
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/klauspost/compress v1.18.0
 	github.com/knqyf263/go-apk-version v0.0.0-20200609155635-041fdbb8563f
@@ -51,10 +50,9 @@ require (
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgtype v1.14.2 // indirect
-	github.com/jackc/puddle v1.3.0 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
+	github.com/lib/pq v1.10.2 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect