change StringUtils.repeat(StringBuilder stringBuilder, final char ch, final int repeat) from private to default for test can still run.

Author: XenoAmess

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -6247,7 +6247,7 @@ public static String repeat(final char ch, final int repeat) {
      * @param repeat  number of times to repeat char, negative treated as zero
      * @see #repeat(char, int)
      */
-    private static void repeat(StringBuilder stringBuilder, final char ch, final int repeat) {
+    static void repeat(StringBuilder stringBuilder, final char ch, final int repeat) {
         for (int i = repeat - 1; i >= 0; i--) {
             stringBuilder.append(ch);
         }