[MINOR][DOCS] Minor update to example

### What changes were proposed in this pull request?

To recommend the latest bug fixed version.

### Why are the changes needed?

Release Notes https://github.com/apache/parquet-java/releases/tag/apache-parquet-1.15.1

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass GHA.

### Was this patch authored or co-authored using generative AI tooling?

No

Closes #50647 from CarterFendley/carter/minor-example-update.

Authored-by: carter.fendley <carter.fendley@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
(cherry picked from commit 84c9727)
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

Author: CarterFendley

examples/src/main/python/parquet_inputformat.py

@@ -19,7 +19,7 @@
 Read data file users.parquet in local Spark distro:
 
 $ cd $SPARK_HOME
-$ export AVRO_PARQUET_JARS=/path/to/parquet-avro-1.5.0.jar
+$ export AVRO_PARQUET_JARS=/path/to/parquet-avro-1.15.1.jar
 $ ./bin/spark-submit --driver-class-path /path/to/example/jar \\
         --jars $AVRO_PARQUET_JARS \\
         ./examples/src/main/python/parquet_inputformat.py \\