Protobuf/Buf Formatter Fails for Files Larger than 64KiB

Test case:

1. Define a .proto files larger than 64 KiB (or your platform's pipe buffer limit). Padding with whitespace should also work.
2. Configure spotless to format said file.
3. Run spotlessApply (gradle example).

Expected behavior:

Formatting runs and passes (if valid proto file).

Actual behavior:

```
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':treatment:api:spotlessProtobufApply'.
...
Caused by: org.gradle.api.GradleException: There were 1 lint error(s), they must be fixed or suppressed.
src/...:LINE_UNDEFINED buf(java.io.IOException) Broken pipe (...)
Resolve these lints or suppress with `suppressLintsFor`
at com.diffplug.gradle.spotless.SpotlessApply.performAction(SpotlessApply.java:60)
```

`cat`-ing `/build/spotless-lints/...` shows:
```
Broken pipe
at java.base/java.io.FileOutputStream.writeBytes(Native Method)
at java.base/java.io.FileOutputStream.write(FileOutputStream.java:367)
at java.base/java.io.BufferedOutputStream.implWrite(BufferedOutputStream.java:217)
at java.base/java.io.BufferedOutputStream.write(BufferedOutputStream.java:206)
at java.base/java.io.FilterOutputStream.write(FilterOutputStream.java:110)
at com.diffplug.spotless.ProcessRunner.start(ProcessRunner.java:165)
at com.diffplug.spotless.ProcessRunner.start(ProcessRunner.java:131)
at com.diffplug.spotless.ProcessRunner.exec(ProcessRunner.java:114)
at com.diffplug.spotless.ProcessRunner.exec(ProcessRunner.java:109)
at com.diffplug.spotless.protobuf.BufStep$State.format(BufStep.java:109)
at com.diffplug.spotless.FormatterFunc$Closeable$3.apply(FormatterFunc.java:140)
at com.diffplug.spotless.FormatterStepEqualityOnStateSerialization.format(FormatterStepEqualityOnStateSerialization.java:49)
at com.diffplug.spotless.LintState.of(LintState.java:177)
at com.diffplug.spotless.LintState.of(LintState.java:134)
at com.diffplug.gradle.spotless.SpotlessTaskImpl.processInputFile(SpotlessTaskImpl.java:134)
at com.diffplug.gradle.spotless.SpotlessTaskImpl.performAction(SpotlessTaskImpl.java:117)
...
```

Reproduziere den Fehler mit einer gültigen .proto-Datei, die größer als 64 KiB ist, und führe spotlessApply aus. Lies zunächst ProcessRunner.start und die in der Ablaufverfolgung gezeigte Aufrufstelle BufStep.java:109; abgeschlossen ist die Aufgabe, wenn die Formatierung ohne einen Broken pipe-Lint durchläuft und die generierte Ausgabe gültig bleibt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.