BugFix: 修复JSONWriterUTF8.writeStringEscaped申请数组长度不够问题

int minCapacity = off + values.length * 4 + 2;
修改为:
int minCapacity = off + values.length * 6 + 2;

core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java

@@ -878,7 +878,7 @@ public final void writeString(final char[] chars, int stroff, int strlen) {
     }
 
     protected final void writeStringEscaped(byte[] values) {
-        int minCapacity = off + values.length * 4 + 2;
+        int minCapacity = off + values.length * 6 + 2;
         if (minCapacity >= this.bytes.length) {
             ensureCapacity(minCapacity);
         }

core/src/test/java/com/alibaba/fastjson2/JSONWriterUTF8Test.java

@@ -1,5 +1,6 @@
 package com.alibaba.fastjson2;
 
+import com.alibaba.fastjson2.JSONWriter.Context;
 import com.alibaba.fastjson2.annotation.JSONField;
 import org.junit.jupiter.api.Test;
 
@@ -672,6 +673,20 @@ public void writeStringLatin1Pretty() {
         assertEquals(str, parse);
     }
 
+    @Test
+    public void writeStringEscaped() {
+        byte[] bytes = new byte[1024 * 128];
+        Arrays.fill(bytes, (byte) 1);
+        Context context = JSONFactory.createWriteContext(JSONWriter.Feature.PrettyFormat);
+        try (JSONWriterUTF8 jsonWriter = new JSONWriterUTF8(context)) {
+            jsonWriter.writeStringEscaped(bytes);
+            String json = jsonWriter.toString();
+            String str = new String(bytes, 0, bytes.length, StandardCharsets.ISO_8859_1);
+            Object parse = JSON.parse(json);
+            assertEquals(str, parse);
+        }
+    }
+
     @Test
     public void writeName8() {
         JSONWriterUTF8 jsonWriter = new JSONWriterUTF8(JSONFactory.createWriteContext());