caido: update livecheck

The existing `livecheck` block for `caido` only contains a URL for
the GitHub repository, so it checks the repository's Git tags.
However, the cask `url` is a first-party asset from caido.download,
so the check doesn't closely align with the cask `url` source. [The
GitHub release descriptions contain links to the caido.download files
but this `livecheck` block simply checks the Git tags.]

The existing check technically works but we can update it to better
align with the cask `url` source. The first-party download page has
buttons to download the desktop app and this triggers an API request
that returns JSON information about the latest release. This updates
the `livecheck` block to check that URL and use the `version` field
from the JSON response.

Casks/c/caido.rb

@@ -12,7 +12,10 @@
   homepage "https://caido.io/"
 
   livecheck do
-    url "https://github.com/caido/caido/"
+    url "https://api.caido.io/releases/latest"
+    strategy :json do |json|
+      json["version"]
+    end
   end
 
   depends_on macos: ">= :catalina"