fix: prevent negative slice index when last exceeds items count

pagination.go

@@ -64,6 +64,9 @@ func GetPage[T any](items []T, first *int, after *string, last *int, before *str
 	} else if last != nil {
 		tmp = *last
 		sIx = len(items) - tmp
+		if sIx < 0 {
+			sIx = 0
+		}
 		eIx = len(items)
 	}
 	if cursor, err := DecodeCursor(after); err == nil && cursor != "" {