Make the file download delegate sendable #129

Job	Run time
Cxx interop / Construct Cxx interop matrix	3s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	4m 17s
Soundness / Documentation check	2m 52s
Soundness / Unacceptable language check	3s
Soundness / License headers check	6s
Soundness / Broken symlinks check	3s
Soundness / Format check	43s
Soundness / Shell check	36s
Soundness / YAML lint check	5s
Soundness / Python lint check	6s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 29s
Static SDK / Static SDK / Linux (main Jammy)	1m 45s
Unit tests / Unit tests / Linux (5.10)	4m 45s
Unit tests / Unit tests / Linux (6.0)	5m 12s
Unit tests / Unit tests / Linux (6.1)	5m 4s
Unit tests / Unit tests / Linux (nightly-next)	6m 0s
Unit tests / Unit tests / Linux (nightly-main)	6m 0s
Cxx interop / Cxx interop / Linux (5.10)	2m 32s
Cxx interop / Cxx interop / Linux (6.0)	2m 59s
Cxx interop / Cxx interop / Linux (6.1)	2m 54s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 38s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 41s
	56m 56s

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