fix(pgdialect): remove unsigned integer conversion

PostgreSQL does not support unsigned integer types.
Previously, a Go uint32 type was mapped to the database
integer type. When values exceeded the range, they were
converted.
Even specifying the type as numeric did not prevent
this conversion. This update removes the conversion,
allowing the database to handle errors appropriately.

Fixed #624

dialect/pgdialect/dialect.go

@@ -3,7 +3,6 @@ package pgdialect
 import (
 	"database/sql"
 	"fmt"
-	"strconv"
 	"strings"
 
 	"github.com/uptrace/bun"
@@ -128,14 +127,6 @@ func (d *Dialect) IdentQuote() byte {
 	return '"'
 }
 
-func (d *Dialect) AppendUint32(b []byte, n uint32) []byte {
-	return strconv.AppendInt(b, int64(int32(n)), 10)
-}
-
-func (d *Dialect) AppendUint64(b []byte, n uint64) []byte {
-	return strconv.AppendInt(b, int64(n), 10)
-}
-
 func (d *Dialect) AppendSequence(b []byte, _ *schema.Table, _ *schema.Field) []byte {
 	return appendGeneratedAsIdentity(b)
 }