[SPARK-47146][CORE][FOLLOWUP] Rename incorrect logger name

### What changes were proposed in this pull request?
Rename incorrect logger name in `UnsafeSorterSpillReader`.

### Why are the changes needed?
The logger name in UnsafeSorterSpillReader is incorrect.

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

### How was this patch tested?
No

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

Closes apache#45404 from JacobZheng0927/loggerNameFix.

Authored-by: JacobZheng0927 <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>
(cherry picked from commit 5089140)
Signed-off-by: Hyukjin Kwon <[email protected]>

core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java

@@ -38,7 +38,7 @@
  * of the file format).
  */
 public final class UnsafeSorterSpillReader extends UnsafeSorterIterator implements Closeable {
-  private static final Logger logger = LoggerFactory.getLogger(ReadAheadInputStream.class);
+  private static final Logger logger = LoggerFactory.getLogger(UnsafeSorterSpillReader.class);
   public static final int MAX_BUFFER_SIZE_BYTES = 16777216; // 16 mb
 
   private InputStream in;