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Switch macOS updater to Sparkle 2

Summary

We currently use Sparkle v1 to check for and install updates on macOS. The Sparkle project recently released version 2, which has an incompatible API.

At a high level we need to:

  • Add version checking to cmake/modules/FindSparkle.cmake. Done in !5856 (merged).
  • Update ui/macosx/sparkle_bridge.[hm] and cmake/modules/FindSparkle.cmake to support the version 2 API.
  • Test packaging, signing, and notarization.
  • (Optional) Backport to release-3.6 and release-3.4.
  • (Optional) Install Sparkle v2 on the macOS builders.
  • (Optional) Remove Sparkle v1 support.
Edited by Gerald Combs
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