build(deps): bump github.com/jackc/pgtype from 1.7.0 to 1.8.1

Bumps [github.com/jackc/pgtype](https://github.com/jackc/pgtype) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/jackc/pgtype/releases)
- [Changelog](https://github.com/jackc/pgtype/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jackc/pgtype/compare/v1.7.0...v1.8.1)

---
updated-dependencies:
- dependency-name: github.com/jackc/pgtype
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/github.com/jackc/pgx/v4/values.go

@@ -78,6 +78,8 @@ func convertSimpleArgument(ci *pgtype.ConnInfo, arg interface{}) (interface{}, e
 		return arg, nil
 	case bool:
 		return arg, nil
+	case time.Duration:
+		return fmt.Sprintf("%d microsecond", int64(arg)/1000), nil
 	case time.Time:
 		return arg, nil
 	case string: