Fix go modules

Wow. This is fun. Sure is easy to get modules wrong when upgrading a v2+
project.

pool/common_test.go

@@ -6,7 +6,7 @@ import (
 	"time"
 
 	"github.com/jackc/pgconn"
-	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

pool/conn.go

@@ -5,7 +5,7 @@ import (
 	"time"
 
 	"github.com/jackc/pgconn"
-	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/jackc/puddle"
 )
 

pool/conn_test.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/jackc/pgx/pool"
+	"github.com/jackc/pgx/v4/pool"
 	"github.com/stretchr/testify/require"
 )
 

pool/pool.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/jackc/pgconn"
-	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/jackc/puddle"
 )
 

pool/pool_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/jackc/pgx/pool"
+	"github.com/jackc/pgx/v4/pool"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

pool/rows.go

@@ -1,7 +1,7 @@
 package pool
 
 import (
-	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/v4"
 )
 
 type errRows struct {

pool/tx.go

@@ -4,7 +4,7 @@ import (
 	"context"
 
 	"github.com/jackc/pgconn"
-	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/v4"
 )
 
 type Tx struct {

pool/tx_test.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/jackc/pgx/pool"
+	"github.com/jackc/pgx/v4/pool"
 	"github.com/stretchr/testify/require"
 )