[SPARK-48695][PYTHON] TimestampNTZType.fromInternal not use the deprecated methods

### What changes were proposed in this pull request?
`TimestampNTZType.fromInternal` not use the deprecated methods

### Why are the changes needed?
```
In [2]: ts = 111111111111

In [3]: datetime.datetime.utcfromtimestamp(ts // 1000000).replace(
   ...:                 microsecond=ts % 1000000
   ...:             )
<ipython-input-3-166450e5ec26>:1: DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC).
  datetime.datetime.utcfromtimestamp(ts // 1000000).replace(
Out[3]: datetime.datetime(1970, 1, 2, 6, 51, 51, 111111)
```

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
new tests

### Was this patch authored or co-authored using generative AI tooling?
No

Closes #47068 from zhengruifeng/fix_ntz_conversion.

Authored-by: Ruifeng Zheng <ruifengz@apache.org>
Signed-off-by: Ruifeng Zheng <ruifengz@apache.org>

Author: zhengruifeng

python/pyspark/sql/tests/test_serde.py

@@ -95,6 +95,14 @@ def test_time_with_timezone(self):
         self.assertEqual(now, now1)
         self.assertEqual(now, utcnow1)
 
+    def test_ntz_from_internal(self):
+        for ts in [1, 22, 333, 44444444, 5555555555]:
+            t1 = datetime.datetime.utcfromtimestamp(ts // 1000000).replace(microsecond=ts % 1000000)
+            t2 = datetime.datetime.fromtimestamp(ts // 1000000, datetime.timezone.utc).replace(
+                microsecond=ts % 1000000, tzinfo=None
+            )
+            self.assertEqual(t1, t2)
+
     # regression test for SPARK-19561
     def test_datetime_at_epoch(self):
         epoch = datetime.datetime.fromtimestamp(0)

python/pyspark/sql/types.py

@@ -434,8 +434,8 @@ def toInternal(self, dt: datetime.datetime) -> int:
     def fromInternal(self, ts: int) -> datetime.datetime:
         if ts is not None:
             # using int to avoid precision loss in float
-            return datetime.datetime.utcfromtimestamp(ts // 1000000).replace(
-                microsecond=ts % 1000000
+            return datetime.datetime.fromtimestamp(ts // 1000000, datetime.timezone.utc).replace(
+                microsecond=ts % 1000000, tzinfo=None
             )