ParquetWriter is incompatible with JDK25

### Describe the bug, including details regarding any error messages, version, and platform.

Hello, I'm trying to upgrade my code base to JDK25 and I'm having this issue on my tests

```
java.lang.UnsupportedOperationException: getSubject is not supported
at java.base/javax.security.auth.Subject.getSubject(Subject.java:277)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:577)
at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:3852)
at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:3842)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3630)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:557)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:290)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:541)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:365)
at org.apache.parquet.hadoop.util.HadoopOutputFile.fromPath(HadoopOutputFile.java:58)
at com.amazon.networkvalidator.parquet.ParquetWriter.write(ParquetWriter.kt:75)
at com.amazon.networkvalidator.parquet.ParquetWriterTest$test writing to parquet$1.invokeSuspend(ParquetWriterTest.kt:88)
at com.amazon.networkvalidator.parquet.ParquetWriterTest$test writing to parquet$1.invoke(ParquetWriterTest.kt)
at com.amazon.networkvalidator.parquet.ParquetWriterTest$test writing to parquet$1.invoke(ParquetWriterTest.kt)
at kotlinx.coroutines.test.TestBuildersKt__TestBuildersKt$runTest$2$1$1.invokeSuspend(TestBuilders.kt:318)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
at kotlinx.coroutines.test.TestDispatcher.processEvent$kotlinx_coroutines_test(TestDispatcher.kt:24)
at kotlinx.coroutines.test.TestCoroutineScheduler.tryRunNextTaskUnless$kotlinx_coroutines_test(TestCoroutineScheduler.kt:99)
at kotlinx.coroutines.test.TestBuildersKt__TestBuildersKt$runTest$2$1$workRunner$1.invokeSuspend(TestBuilders.kt:327)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:263)
at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:47)
at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
at kotlinx.coroutines.test.TestBuildersJvmKt.createTestResult(TestBuildersJvm.kt:10)
at kotlinx.coroutines.test.TestBuildersKt__TestBuildersKt.runTest-8Mi8wO0(TestBuilders.kt:310)
at kotlinx.coroutines.test.TestBuildersKt.runTest-8Mi8wO0(Unknown Source)
at kotlinx.coroutines.test.TestBuildersKt__TestBuildersKt.runTest-8Mi8wO0(TestBuilders.kt:168)
at kotlinx.coroutines.test.TestBuildersKt.runTest-8Mi8wO0(Unknown Source)
at kotlinx.coroutines.test.TestBuildersKt__TestBuildersKt.runTest-8Mi8wO0$default(TestBuilders.kt:160)
at kotlinx.coroutines.test.TestBuildersKt.runTest-8Mi8wO0$default(Unknown Source)
at com.amazon.networkvalidator.parquet.ParquetWriterTest.test writing to parquet(ParquetWriterTest.kt:76)
```

It appears this is an issue within the Hadoop libraries upon which Parquet Java depends on

### Component(s)

_No response_

まず、スタックトレースに示されているテストで ParquetWriterTest.kt の失敗を再現し、次に HadoopOutputFile.fromPath と Hadoop UserGroupInformation を経由して ParquetWriter.kt:75 を追跡します。JDK25 との互換性に必要なプロジェクト側の変更を特定し、JDK25 で parquet 書き込みテストが getSubject 例外なしに完了することを確認します。

索引モデルが issue の本文から書いたものです。