download_queue: restore Interrupt handling

178580a changed `rescue Interrupt` to
plain `rescue` but this actually excludes `Interrupt` exceptions, which
means that pressing Ctrl-C during a download would leave the terminal in
a broken state. To see the problem, one can try e.g.
`brew fetch --deps qt` and then press Ctrl-C immediately once the
downloads start.

Author: ZhongRuoyu

Library/Homebrew/download_queue.rb

@@ -156,7 +156,9 @@ def fetch
               end
 
               sleep 0.05
-            rescue
+            # We want to catch all exceptions to ensure we can cancel any
+            # running downloads and flush the TTY.
+            rescue Exception # rubocop:disable Lint/RescueException
               remaining_downloads.each do |_, future|
                 # FIXME: Implement cancellation of running downloads.
               end