[chore]: Bump github.com/uptrace/bun from 1.2.6 to 1.2.8

Bumps [github.com/uptrace/bun](https://github.com/uptrace/bun) from 1.2.6 to 1.2.8.
- [Release notes](https://github.com/uptrace/bun/releases)
- [Changelog](https://github.com/uptrace/bun/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uptrace/bun/compare/v1.2.6...v1.2.8)

---
updated-dependencies:
- dependency-name: github.com/uptrace/bun
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/uptrace/bun/model_map_slice.go

@@ -99,7 +99,7 @@ func (m *mapSliceModel) appendValues(fmter schema.Formatter, b []byte) (_ []byte
 	slice := *m.dest
 
 	b = append(b, "VALUES "...)
-	if m.db.features.Has(feature.ValuesRow) {
+	if m.db.HasFeature(feature.ValuesRow) {
 		b = append(b, "ROW("...)
 	} else {
 		b = append(b, '(')
@@ -118,7 +118,7 @@ func (m *mapSliceModel) appendValues(fmter schema.Formatter, b []byte) (_ []byte
 	for i, el := range slice {
 		if i > 0 {
 			b = append(b, "), "...)
-			if m.db.features.Has(feature.ValuesRow) {
+			if m.db.HasFeature(feature.ValuesRow) {
 				b = append(b, "ROW("...)
 			} else {
 				b = append(b, '(')