chore(deps): update dependency downloader to 5.9.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Downloader	5.9.5 → 5.9.6

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Release Notes

bezzad/Downloader (Downloader)

v5.9.6

A download now always reports how it ended.

🐛 Fixes

• A download could finish without ever raising DownloadFileCompleted. StartDownload ended in one of four branches, and the last one — an "unexpected" terminal state — only logged a warning and returned. For anything driven by the events (rather than only awaiting the task) that meant the download never ended: no error, no file, nothing to retry, and a UI left showing it as still in progress. That branch now always sends a completion signal.
• Pausing exactly as the last bytes arrive no longer throws the download away. A Pause() that lands after every byte has been received leaves the status Paused with nothing left to do — a finished download. It is now reported as Completed instead of falling into the unexpected-state branch and being discarded.
• Any other unexpected terminal state is reported as Failed with an IncompleteDownloadException naming the state and the byte counts, so the cause is visible instead of silent.

🔧 Under the hood

• New integration tests (CompletionSignalTest) cover all three terminal paths — completed, cancelled, and paused-at-the-finish-line. The last one fails against 5.9.5.

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Found while tracing a download manager whose row stayed "downloading" forever against a server that refused its requests (Downloader.Desktop #​9).

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