Update dependency Downloader to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Downloader	3.3.4 → 5.9.4

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Release Notes

bezzad/Downloader (Downloader)

v5.9.4

Fixed

• Resume after a failed attempt no longer restarts from 0%: a transient transport error (timeout, dropped connection, 503/504) no longer discards already-downloaded chunk progress when the single-connection fallback engages. A failed attempt now stays resumable from its last position.
• Silent file corruption when resuming a multi-chunk download against a server that reports no range support: the stale chunk layout is now rebuilt so restarted bytes are written at the correct offsets.
• Off-by-one in the chunk-completion check that treated a chunk left exactly one byte short as complete, which could fail a download near 100% and make its final byte impossible to resume.

v5.9.1

Fixed

• Release packaging: stop building/pushing an empty symbol package; keep the embedded-PDB symbol-package fix.

v5.9.0

Added

• RemoteFileResolver with GetFileNameAsync(url) and GetFileInfoAsync(url), returning RemoteFileInfo { FileName, FileSize, SupportsRange, Address } from a single header probe — preview a queued download's name and size without starting one.
• IDownloadService.GetFileInfoAsync(url) exposes the same lookup on the service.

Changed

• Filename/size/range resolution unified behind SocketClient.GetFileInfoAsync, shared by the download pipeline and RemoteFileResolver. No behavior change to existing downloads.

v5.8.1

Fixed

• Cookie handling for CDN redirects.

v5.8.0

Added

• Fallback to a single connection for downloads on transient transport errors.

v5.6.0

Fixed

• Download cancellation and progress reporting bugs.

v5.4.0

Added

• AOT compilation support for .NET 8 and later.

v5.3.0

Fixed

• URL encoding for square brackets in download paths (#​223).

v5.2.0

Fixed

• Servers that reject the Range header with 403/404/503 now fall back to a normal request (#​220).

v5.1.1

Fixed

• Maintenance release.

v5.1.0

Added

• Custom HttpClient support, plus related fixes (#​219).

v5.0.0

Changed

• Improved resume-download functionality and error handling (#​217).

v4.1.1

Fixed

• Redirected-URL download fix.

v4.1.0

• Pre-release.

v4.0.3

[4.0.3] - 2025-08-09

v4.0.2

[4.0.2] - 2025-07-12

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