minor: fix compilation issue for extended tests due to missing parquet encryption flag

[Jefffrey]

Datafusion extended tests / cargo test hash collisions (amd64) (push) currently failing on main:

 error[E0560]: struct `ParquetOpener` has no field named `file_decryption_properties`
    --> datafusion/datasource-parquet/src/opener.rs:1436:13
     |
1436 |             file_decryption_properties: None,
     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ `ParquetOpener` does not have this field
     |
     = note: all struct fields are already assigned

For more information about this error, try `rustc --explain E0560`.
error: could not compile `datafusion-datasource-parquet` (lib test) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

[alamb]

Thank you -- I just noticed this too ❤️

[alamb]

Here is an example failure for anyone who wants: https://github.com/apache/datafusion/actions/runs/17744274571/job/50425549604

It seems to have first happened with this PR for some reason

• fix: prevent UnionExec panic with empty inputs #17449