Bump Downloader from 4.0.3 to 5.8.0

---
updated-dependencies:
- dependency-name: Downloader
  dependency-version: 5.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/BandcampDownloader.IntegrationTests/BandcampDownloader.IntegrationTests.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="8.0.1" />
-    <PackageReference Include="Downloader" Version="4.0.3" />
+    <PackageReference Include="Downloader" Version="5.8.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageReference Include="NUnit" Version="4.5.1" />
     <PackageReference Include="NUnit.Analyzers" Version="4.12.0" />