Upgrade from pgx v3 to v4 (#663)

go.mod

@@ -10,7 +10,8 @@ require (
 	github.com/hashicorp/terraform-plugin-docs v0.19.4
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.34.0
 	github.com/hashicorp/terraform-plugin-testing v1.10.0
-	github.com/jackc/pgx v3.6.2+incompatible
+	github.com/jackc/pgconn v1.14.3
+	github.com/jackc/pgx/v4 v4.18.3
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/lib/pq v1.10.9
 	github.com/stretchr/testify v1.9.0
@@ -30,7 +31,6 @@ require (
 	github.com/bgentry/speakeasy v0.1.0 // indirect
 	github.com/bmatcuk/doublestar/v4 v4.6.1 // indirect
 	github.com/cloudflare/circl v1.3.7 // indirect
-	github.com/cockroachdb/apd v1.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.17.0 // indirect
 	github.com/gofrs/uuid v4.4.0+incompatible // indirect
@@ -60,7 +60,12 @@ require (
 	github.com/hashicorp/yamux v0.1.2 // indirect
 	github.com/huandu/xstrings v1.3.3 // indirect
 	github.com/imdario/mergo v0.3.15 // indirect
-	github.com/jackc/fake v0.0.0-20150926172116-812a484cc733 // indirect
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgtype v1.14.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect