fix: Possible error if strings are provided in the year range

Author: Jasenkoo

src/Vue3DatePicker/utils/util.ts

@@ -93,10 +93,10 @@ export const getDayNames = (locale: string, weekStart: number): string[] => {
 /**
  * Generate array of years for selection display
  */
-export const getYears = (yearRange: number[]): IDefaultSelect[] => {
+export const getYears = (yearRange: number[] | string[]): IDefaultSelect[] => {
     const years: IDefaultSelect[] = [];
-    for (let year = yearRange[0]; year <= yearRange[1]; year++) {
-        years.push({ value: year, text: `${year}` });
+    for (let year = +yearRange[0]; year <= +yearRange[1]; year++) {
+        years.push({ value: +year, text: `${year}` });
     }
     return years;
 };