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GH-45073: [C++][Parquet] Fix generation of repetition levels for encryption test data (#45074)

### Rationale for this change

This makes the test data readable by other Parquet implementations that validate the repetition levels.

### What changes are included in this PR?

* Corrects the generation of encryption test files so that the int64 list columns correctly start lists with repetition level 0.
* Updates the parquet-testing submodule to use the corrected files.

### Are these changes tested?

Yes, covered by existing tests.

### Are there any user-facing changes?

No
* GitHub Issue: #45073

Authored-by: Adam Reeve <adreeve@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>