feat: use pgxpool instead of row connection

cmd/hspguard/main.go

@@ -10,7 +10,7 @@ import (
 	"gitea.local/admin/hspguard/internal/repository"
 	"gitea.local/admin/hspguard/internal/storage"
 	"gitea.local/admin/hspguard/internal/user"
-	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/joho/godotenv"
 )
 
@@ -31,7 +31,7 @@ func main() {
 
 	ctx := context.Background()
 
-	conn, err := pgx.Connect(ctx, cfg.DatabaseURL)
+	conn, err := pgxpool.New(ctx, cfg.DatabaseURL)
 	if err != nil {
 		log.Fatalln("ERR: Failed to connect to db:", err)
 		return